part i

. p. 15). In 1201 Pope Innocent III. granted a rule to this third order. Sabatier has drawn attention to the resemblances between this rule and the _Regula de poenitentia_ granted to Franciscanism in the course of its development; on the other hand, it is incontestable that Innocent III. wished to reconcile the order with the Waldenses, and, indeed, its rule reproduces several of the Waldensian propositions, ingeniously modified in the orthodox sense, but still very easily recognizable. It forbade useless oaths and the taking of God's name in vain; allowed voluntary poverty and marriage; regulated pious exercises; and approved the solidarity which already existed among the members of the association. Finally, by a singular concession, it authorized them to meet on Sunday to listen to the words of a brother "of proved faith and prudent piety," on condition that the hearers should not discuss among themselves either the articles of faith or the sacraments of the church. The bishops were forbidden to oppose any of the utterances of the Humiliati brethren, "for the spirit must not be stifled." James of Vitry, without being unfavourable to their tendencies, represents their association as one of the peculiarities of the church of his time (_Historia orientalis_, Douai, 1597). So broad a discipline must of necessity have led back some waverers into the pale of the church, but the Waldenses of Lombardy, in their _congregationes laborantium_, preserved the tradition of the independent Humiliati. Indeed, this tradition is confounded throughout the later 12th century with the history of the Waldenses. The "Chronicon Urspergense" (_Mon. Germ. hist. Scriptores_, xxiii. 376-377) mentions the Humiliati as one of the two Waldensian sects. The celebrated decretal promulgated in 1184 by Pope Lucius III. at the council of Verona against all heretics condemns at the same time as the "Poor Men of Lyons" "those who attribute to themselves falsely the name of Humiliati," at the very time when this name denoted an order recognized by the papacy. This order, though orthodox, was always held in tacit and ever-increasing suspicion, and, in consequence of grave disorders, Pius V. suppressed the entire congregation in February 1570-71.

See Tiraboschi, _Vetera humiliatorum monumenta_ (Milan, 1766); K. Muller, _Die Waldenser_ (Gotha, 1886); W. Preger, _Beitrage zur Geschichte der Waldensier_ (Munich, 1875). (P. A.)

HUMITE, a group of minerals consisting of basic magnesium fluo-silicates, with the following formulae:--Chondrodite, Mg3[Mg(F, OH)]2[SiO4]2; Humite, Mg5[Mg(F, OH)]2[SiO4]3; Clinohumite, Mg7[Mg(F, OH)]2[SiO4]4. Humite crystallizes in the orthorhombic and the two others in the monoclinic system, but between them there is a close crystallographic relation: the lengths of the vertical axes are in the ratio 5:7:9, and this is also the ratio of the number of magnesium atoms present in each of the three minerals. These minerals are strikingly similar in appearance, and can only be distinguished by the goniometric measurement of the complex crystals. They are honey-yellow to brown or red in colour, and have a vitreous to resinous lustre; the hardness is 6-6(1/2), and the specific gravity 3.1-3.2. Further, they often occur associated together, and it is only comparatively recently that the three species have been properly discriminated. The name humite, after Sir Abraham Hume, Bart. (1749-1839), whose collection of diamond crystals is preserved at Cambridge in the University museum, was given by the comte de Bournon in 1813 to the small and brilliant honey-yellow crystals found in the blocks of crystalline limestone ejected from Monte Somma, Vesuvius; all three species have since been recognized at this locality. Chondrodite (from [Greek: chondros], "a grain") was a name early (1817) in use for granular forms of these minerals found embedded in crystalline limestones in Sweden, Finland and at several place in New York and New Jersey. Large hyacinth-red crystals of all three species are associated with magnetite in the Tilly Foster iron-mine at Brewster, New York; and at Kafveltorp in Orebro, Sweden, similar crystals (of chondrodite) occur embedded in galena and chalcopyrite.

The relation mentioned above between the crystallographic constants and the chemical composition is unique amongst minerals, and is known as a morphotropic relation. S. L. Penfield and W. T. H. Howe, who in 1894 noticed this relation, predicted the existence of another member of the series, the crystals of which would have a still shorter vertical axis and contain less magnesium, the formula being Mg[Mg(F, OH)]2SiO4; this has since been discovered and named prolectite (from [Greek: prolegein], "to foretell"). (L. J. S.)

HUMMEL, JOHANN NEPOMUK (1778-1837), German composer and pianist, was born on the 14th of November 1778, at Pressburg, in Hungary, and received his first artistic training from his father, himself a musician. In 1785 the latter received an appointment as conductor of the orchestra at the theatre of Schikaneder, the friend of Mozart and the librettist of the _Magic Flute_. It was in this way that Hummel became acquainted with the composer, who took a great fancy to him, and even invited him to his house for a considerable period. During two years, from the age of seven to nine, Hummel received the invaluable instruction of Mozart, after which he set out with his father on an artistic tour through Germany, England and other countries, his clever playing winning the admiration of amateurs. He began to compose in his eleventh year. After his return to Vienna he completed his studies under Albrechtsberger and Haydn, and for a number of years devoted himself exclusively to composition. At a later period he learned song-writing from Salieri. For some years he held the appointment of orchestral conductor to Prince Eszterhazy, probably entering upon this office in 1807. From 1811 to 1815 he lived in Vienna. On the 18th of May 1813 he married Elisabeth Rockl, a singer, and the sister of one of Beethoven's friends. It was not till 1816 that he again appeared in public as a pianist, his success being quite extraordinary. His gift of improvisation at the piano was especially admired, but his larger compositions also were highly appreciated, and for a time Hummel was considered one of the leading musicians of an age in which Beethoven was in the zenith of his power. In Prussia, which he visited in 1822, the ovations offered to him were unprecedented, and other countries--France in 1825 and 1829, Belgium in 1826 and England in 1830 and 1833--added further laurels to his crown. He died in 1837 at Weimar, where for a long time he had been the musical conductor of the court theatre. His compositions are very numerous, and comprise almost every branch of music. He wrote, amongst other things, several operas, both tragic and comic, and two grand masses (Op. 80 and 111). Infinitely more important are his compositions for the pianoforte (his two concerti in A minor and B minor, and the sonata in F sharp minor), and his chamber music (the celebrated septet, and several trios, &c.). His experience as a player and teacher of the pianoforte was embodied in his _Great Pianoforte School_ (Vienna), and the excellence of his method is further proved by such pupils as Henselt and Ferdinand Hiller. Both as a composer and as a pianist Hummel continued the traditions of the earlier Viennese school of Mozart and Haydn; his style in both capacities was marked by purity and correctness rather than by passion and imagination.

HUMMING-BIRD, a name in use, possibly ever since English explorers first knew of them, for the beautiful little creatures to which, from the sound occasionally made by the rapid vibrations of their wings, it is applied. Among books that are ordinarily in naturalists' hands, the name seems to be first found in the _Musaeum Tradescantianum_, published in 1656, but it therein occurs (p. 3) so as to suggest its having already been accepted and commonly understood; and its earliest use, as yet traced, is by Thomas Morton (d. 1646), a disreputable lawyer who had a curiously adventurous career in New England, in the _New English Canaan_, printed in 1637--a rare work giving an interesting description of the natural scenery and social life in New England in the 17th century, and reproduced by Peter Force in his _Historical Tracts_ (vol. ii., Washington, 1838). Andre Thevet, in his _Singularitez de la France antarctique_ (Antwerp, 1558, fol. 92), has been more than once cited as the earliest author to mention humming-birds, which he did under the name of _Gouambuch_; but it is quite certain that Oviedo, whose _Hystoria general de las Indias_ was published at Toledo in 1525, preceded him by more than thirty years, with an account of the "paxaro mosquito" of Hispaniola, of which island "the first chronicler of the Indies" was governor.[1] This name, though now apparently disused in Spanish, must have been current about that time, for we find Gesner in 1555 (_De avium natura_, iii. 629) translating it literally into Latin as _Passer muscatus_, owing, as he says, his knowledge of the bird to Cardan, the celebrated mathematician, astrologer and physician, from whom we learn (_Comment. in Ptolem. de astr. judiciis_, Basel, 1554, p. 472) that, on his return to Milan from professionally attending Archbishop Hamilton at Edinburgh, he visited Gesner at Zurich, about the end of the year 1552.[2] The name still survives in the French _oiseau-mouche_; but the ordinary Spanish appellation is, and long has been, _Tominejo_, from _tomin_, signifying a weight equal to the third part of an _adarme_ or drachm, and used metaphorically for anything very small. Humming-birds, however, are called by a variety of other names, many of them derived from American languages, such as _Guainumbi_, _Ourissia_ and _Colibri_, to say nothing of others bestowed upon them (chiefly from some peculiarity of habit) by Europeans, like _Picaflores_, _Chuparosa_ and _Froufrou_. Barrere, in 1745, conceiving that humming-birds were allied to the wren, the _Trochilus_,[3] in part, of Pliny, applied that name in a generic sense (_Ornith. spec. novum_, pp. 47, 48) to both. Taking the hint thus afforded, Linnaeus very soon after went farther, and, excluding the wrens, founded his genus _Trochilus_ for the reception of such humming-birds as were known to him. The unfortunate act of the great nomenclator cannot be set aside; and, since his time, ornithologists, with but few exceptions, have followed his example, so that nowadays humming-birds are universally recognized as forming the family _Trochilidae_.

The relations of the _Trochilidae_ to other birds were for a long while very imperfectly understood. Nitzsch first drew attention to their agreement in many essential characters with the swifts, _Cypselidae_, and placed the two families in one group, which he called _Macrochires_, from the great length of their manual bones, or those forming the extremity of the wing. The name was perhaps not very happily chosen, for it is not the distal portion that is so much out of ordinary proportion to the size of the bird, but the proximal and median portions, which in both families are curiously dwarfed. Still the _manus_, in comparison with the other parts of the wing, is so long that the term _Macrochires_ is not wholly inaccurate. The affinity of the _Trochilidae_ and _Cypselidae_ once pointed out, became obvious to every careful and unprejudiced investigator, and there are probably few systematists now living who refuse to admit its validity. More than this, it is confirmed by an examination of other osteological characters. The "lines," as a boat-builder would say, upon which the skeleton of each form is constructed are precisely similar, only that whereas the bill is very short and the head wide in the swifts, in the humming-birds the head is narrow and the bill long--the latter developed to an extraordinary degree in some of the _Trochilidae_, rendering them the longest-billed birds known.[4] Huxley takes these two families, together with the goatsuckers (_Caprimulgidae_), to form the division _Cypselomorphae_--one of the two into which he separated his larger group _Aegithognathae_. However, the most noticeable portion of the humming-bird's skeleton is the _sternum_, which in proportion to the size of the bird is enormously developed both longitudinally and vertically, its deep keel and posterior protraction affording abundant space for the powerful muscles which drive the wings in their rapid vibrations as the little creature poises itself over the flowers where it finds its food.[5]

So far as is known, all humming-birds possess a protrusible tongue, in conformation peculiar among the class _Aves_, though to some extent similar to that member in the woodpeckers (_Picidae_)[6]--the "horns" of the hyoid apparatus upon which it is seated being greatly elongated, passing round and over the back part of the head, near the top of which they meet, and thence proceed forward, lodged in a broad and deep groove, till they terminate in front of the eyes. But, unlike the tongue of the woodpeckers, that of the humming-birds consists of two cylindrical tubes, tapering towards the point, and forming two sheaths which contain the extensile portion, and are capable of separation, thereby facilitating the extraction of honey from the nectaries of flowers, and with it, what is of far greater importance for the bird's sustenance, the small insects that have been attracted to feed upon the honey.[7] These, on the tongue being withdrawn into the bill, are caught by the mandibles (furnished in the males of many species with fine, horny, saw like teeth[8]), and swallowed in the usual way. The stomach is small, moderately muscular, and with the inner coat slightly hardened. There seem to be no caeca. The trachea is remarkably short, the bronchi beginning high up on the throat, and song-muscles are wholly wanting, as in all other _Cypselomorphae_.[9]

Humming-birds comprehend the smallest members of the class Aves. The largest among them measures no more than 8(1/2) and the least 2(3/8) in. in length, for it is now admitted generally that Sloane must have been in error when he described (_Voyage_, ii. 308) the "least humming-bird of Jamaica" as "about 1(1/4) in. long from the end of the bill to that of the tail"--unless, indeed, he meant the proximal end of each. There are, however, several species in which the tail is very much elongated, such as the _Aithurus polytmus_ (fig. 1) of Jamaica, and the remarkable _Loddigesia mirabilis_ of Chachapoyas in Peru, which last was for some time only known from a unique specimen (_Ibis_, 1880, p. 152); but "trochilidists" in giving their measurements do not take these extraordinary developments into account. Next to their generally small size, the best-known characteristic of the _Trochilidae_ is the wonderful brilliancy of the plumage of nearly all their forms, in which respect they are surpassed by no other birds, and are only equalled by a few, as, for instance, by the _Nectariniidae_, or sun-birds of the tropical parts of the Old World, in popular estimation so often confounded with them.

[Illustration: From _The Cambridge Natural History_, vol. xi., "Birds," by permission of Macmillan & Co., Ltd.

FIG. 1.--_Aithurus polytmus._]

The number of species of humming-birds now known to exist considerably exceeds 400; and, though none departs very widely from what a morphologist would deem the typical structure of the family, the amount of modification, within certain limits, presented by the various forms is surprising and even bewildering to the uninitiated. But the features that are ordinarily chosen by systematic ornithologists in drawing up their schemes of classification are found by the "trochilidists," or special students of the _Trochilidae_, insufficient for the purpose of arranging these birds in groups, and characters on which genera can be founded have to be sought in the style and coloration of plumage, as well as in the form and proportions of those parts which are most generally deemed sufficient to furnish them. Looking to the large number of species to be taken into account, convenience has demanded what science would withhold, and the genera established by the ornithologists of a preceding generation nave been broken up by their successors into multitudinous sections--the more adventurous making from 150 to 180 of such groups, the modest being content with 120 or thereabouts, but the last dignifying each of them by the title of genus. It is of course obvious that these small divisions cannot be here considered in detail, nor would much advantage accrue by giving statistics from the works of recent trochilidists, such as Gould,[10] Mulsant[11] and Elliot.[12] It would be as unprofitable here to trace the successive steps by which the original genus _Trochilus_ of Linnaeus, or the two genera _Polytmus_ and _Mellisuga_ of Brisson, have been split into others, or have been added to, by modern writers, for not one of these professes to have arrived at any final, but only a provisional, arrangement; it seems, however, expedient to notice the fact that some of the authors of the 18th century[13] supposed themselves to have seen the way to dividing what we now know as the family _Trochilidae_ into two groups, the distinction between which was that in the one the bill was arched and in the other straight, since that difference has been insisted on in many works. This was especially the view taken by Brisson and Buffon, who termed the birds having the arched bill "colibris," and those having it straight "oiseaux-mouches." The distinction wholly breaks down, not merely because there are _Trochilidae_ which possess almost every gradation of decurvation of the bill, but some which have the bill upturned after the manner of that strange bird the avocet,[14] while it may be remarked that several of the species placed by those authorities among the "colibris" are not humming-birds at all.

In describing the extraordinary brilliant plumage which most of the _Trochilidae_ exhibit, ornithologists have been compelled to adopt the vocabulary of the jeweller in order to give an idea of the indescribable radiance that so often breaks forth from some part or other of the investments of these feathered gems. In all, save a few other birds, the most imaginative writer sees gleams which he may adequately designate metallic, from their resemblance to burnished gold, bronze, copper or steel, but such similitudes wholly fail when he has to do with the _Trochilidae_, and there is hardly a precious stone--ruby, amethyst, sapphire, emerald or topaz--the name of which may not fitly, and without any exaggeration, be employed in regard to humming-birds. In some cases this radiance beams from the brow, in some it glows from the throat, in others it shines from the tail-coverts, in others it sparkles from the tip only of elongated feathers that crest the head or surround the neck as with a frill, while again in others it may appear as a luminous streak across the cheek or auriculars. The feathers that cover the upper parts of the body very frequently have a metallic lustre of golden-green, which in other birds would be thought sufficiently beautiful, but in the _Trochilidae_ its sheen is overpowered by the almost dazzling splendour that radiates from the spots where Nature's lapidary has set her jewels. The flight feathers are almost invariably dusky--the rapidity of their movement would, perhaps, render any display of colour ineffective: while, on the contrary, the feathers of the tail, which, as the bird hovers over its food-bearing flowers, is almost always expanded, and is therefore comparatively motionless, often exhibit a rich translucency, as of stained glass, but iridescent in a manner that no stained glass ever is--cinnamon merging into crimson, crimson changing to purple, purple to violet, and so to indigo and bottle-green. But this part of the humming-bird is subject to quite as much modification in form as in colour, though always consisting of ten _rectrices_. It may be nearly square, or at least but slightly rounded, or wedge-shaped with the middle quills prolonged beyond the rest; or, again, it may be deeply forked, sometimes by the overgrowth of one or more of the intermediate pairs, but most generally by the development of the outer pair. In the last case the lateral feathers may be either broadly webbed to their tip or acuminate, or again, in some forms, may lessen to the filiform shaft, and suddenly enlarge into a terminal spatulation as in the forms known as "racquet tails." The wings do not offer so much variation; still there are a few groups in which diversities occur that require notice. The primaries are invariably ten in number, the outermost being the longest, except in the single instance of _Aithurus_, where it is shorter than the next. The group known as "sabre-wings," comprising the genera _Campylopterus_, _Eupetomena_ and _Sphenoproctus_, present a most curious sexual peculiarity, for while the female has nothing remarkable in the form of the wing, in the male the shaft of two or three of the outer primaries is dilated proximally, and bowed near the middle in a manner almost unique among birds. The feet again, diminutive as they are, are very diversified in form. In most the tarsus is bare, but in some groups, as _Eriocnemis_, it is clothed with tufts of the most delicate down, sometimes black, sometimes buff, but more often of a snowy whiteness. In some the toes are weak, nearly equal in length, and furnished with small rounded nails; in others they are largely developed, and armed with long and sharp claws.

Apart from the well-known brilliancy of plumage, of which enough has been here said, many humming-birds display a large amount of ornamentation in the addition to their attire of crests of various shape and size, elongated ear-tufts, projecting neck-frills, and pendant beards--forked or forming a single point. But it would be impossible here to dwell on a tenth of these beautiful modifications, each of which as it comes to our knowledge excites fresh surprise and exemplifies the ancient adage--_maxime miranda in minimis Natura_. It must be remarked, however, that there are certain forms which possess little or no brilliant colouring at all, but, as most tropical birds go, are very soberly clad. These are known to trochilidists as "hermits," and by Gould have been separated as a subfamily under the name of _Phaethornithinae_, though Elliot says he cannot find any characters to distinguish it from the _Trochilidae_ proper. But sight is not the only sense that is affected by humming-birds. The large species known as _Pterophanes temmincki_ has a strong musky odour, very similar to that given off by the petrels, though, so far as appears to be known, that is the only one of them that possesses this property.[15]

[Illustration: From _The Cambridge National History_, vol. ix., "Birds," by permission of Macmillan & Co. Ltd.

FIG. 2.--_Eulampis jugularus_.]

All well-informed people are aware that the _Trochilidae_ are a family peculiar to America and its islands, but one of the commonest of common errors is the belief that humming-birds are found in Africa and India--to say nothing even of England. In the first two cases the mistake arises from confounding them with some of the brightly-coloured sun-birds (_Nectariniidae_), to which British colonists or residents are apt to apply the better-known name; but in the last it can be only due to the want of perception which disables the observer from distinguishing between a bird and an insect--the object seen being a hawk-moth (_Macroglossa_), whose mode of feeding and rapid flight certainly bears some resemblance to that of the Trochilidae, and hence one of the species (_M. stellarum_) is very generally called the "humming-bird hawk-moth." But though confined to the New World the _Trochilidae_ pervade almost every part of it. In the south _Eustephanus galeritus_ has been seen flitting about the fuchsias of Tierra del Fuego in a snow-storm, and in the north-west _Selatophorus rufus_ in summer visits the ribes-blossoms of Sitka, while in the north-east _Trochilus colubris_ charms the vision of Canadians as it poises itself over the althaea-bushes in their gardens, and extends its range at least so far as lat. 57 deg. N. Nor is the distribution of humming-birds limited to a horizontal direction only, it rises also vertically. _Oreotrochilus chimborazo_ and _O. pichincha_ live on the lofty mountains whence each takes its specific name, but just beneath the line of perpetual snow, at an elevation of some 16,000 ft., dwelling in a world of almost constant hall, sleet and rain, and-feeding on the insects which resort to the indigenous flowering plants, while other peaks, only inferior to these in height, are no less frequented by one or more species. Peru and Bolivia produce some of the most splendid of the family--the genera _Cometes_, _Diphlogaena_ and _Thaumastura_, whose very names indicate the glories of their bearers. The comparatively gigantic _Patagona_ inhabits the west coast of South America, while the isolated rocks of Juan Fernandez not only afford a home to the _Eustephanus_ but also to two other species of the same genus which are not found elsewhere. The slopes of the Northern Andes and the hill country of Colombia furnish perhaps the greatest number of forms, and some of the most beautiful, but leaving that great range, we part company with the largest and most gorgeously arrayed species, and their number dwindles as we approach the eastern coast. Still there are many brilliant humming-birds common enough in the Brazils, Guiana and Venezuela. The _Chrysolampis mosquitus_ is perhaps the most plentiful. Thousands of its skins are annually sent to Europe to be used in the manufacture of ornaments, its rich ruby-and-topaz glow rendering it one of the most beautiful objects imaginable. In the darkest depths of the Brazilian forests dwell the russet-clothed brotherhood of the genus _Phaethornis_--the "hermits"; but the great wooded basin of the Amazons seems to be particularly unfavourable to the _Trochilidae_, and from Para to Ega there are scarcely a dozen species to be met with. There is no island of the Antilles but is inhabited by one or more humming-birds, and there are some very remarkable singularities of geographical distribution to be found. Northwards from Panama the highlands present many genera whose names it would be useless here to insert, few or none of which are found in South America--though that must unquestionably be deemed the metropolis of the family--and advancing towards Mexico the numbers gradually fall off. Eleven species have been enrolled among the fauna of the United States, but some on slender evidence, while others only just cross the frontier line.

The habits of humming-birds have been ably treated by writers like Waterton, Wilson and Audubon, to say nothing of P. H. Gosse, A. R. Wallace, H. W. Bates and others. But there is no one appreciative of the beauties of nature who will not recall to memory with delight the time when a live humming-bird first met his gaze. The suddenness of the apparition, even when expected, and its brief duration, are alone enough to fix the fluttering vision on the mind's eye. The wings of the bird, if flying, are only visible as a thin grey film, bounded above and below by fine black threads, in form of a St Andrew's cross,--the effect on the observer's retina of the instantaneous reversal of the motion of the wing at each beat--the strokes being so rapid as to leave no more distinct image. Consequently an adequate representation of the bird on the wing cannot be produced by the draughtsman. Humming-birds show to the greatest advantage when engaged in contest with another, for rival cocks fight fiercely, and, as may be expected, it is then that their plumage flashes with the most glowing tints. But these are quite invisible to the ordinary spectator except when very near at hand, though doubtless efficient enough for their object, whether that be to inflame their mate or to irritate or daunt their opponent, or something that we cannot compass. Humming-birds, however, will also often sit still for a while, chiefly in an exposed position, on a dead twig, occasionally darting into the air, either to catch a passing insect or to encounter an adversary; and so pugnacious are they that they will frequently attack birds many times bigger than themselves, without, as would seem, any provocation.

The food of humming-birds consists mainly of insects, mostly gathered in the manner already described from the flowers they visit; but, according to Wallace, there are many species which he has never seen so occupied, and the "hermits" especially seem to live almost entirely upon the insects which are found on the lower surface of leaves, over which they will closely pass their bill, balancing themselves the while vertically in the air. The same excellent observer also remarks that even among the common flower-frequenting species he has found the alimentary canal entirely filled with insects, and very rarely a trace of honey. It is this fact doubtless that has hindered almost all attempts at keeping them in confinement for any length of time--nearly every one making the experiment having fed his captives only with syrup, which, without the addition of some animal food, is insufficient as sustenance, and seeing therefore the wretched creatures gradually sink into inanition and die of hunger. With better management, however, several species have been brought on different occasions to Europe, some of them to England.

The beautiful nests of humming-birds, than which the work of fairies could not be conceived more delicate, are to be seen in most museums, and will be found on examination to be very solidly and tenaciously built, though the materials are generally of the slightest--cotton-wool or some vegetable down and spiders' webs. They vary greatly in form and ornamentation--for it would seem that the portions of lichen which frequently bestud them are affixed to their exterior with that object, though probably concealment was the original intention. They are mostly cup-shaped, and the singular fact is on record (_Zool. Journal_, v. p. 1) that in one instance as the young grew in size the walls were heightened by the parents, until at last the nest was more than twice as big as when the eggs were laid and hatched. Some species, however, suspend their nests from the stem or tendril of a climbing plant, and more than one case has been known in which it has been attached to a hanging rope. These pensile nests are said to have been found loaded on one side with a small stone or bits of earth to ensure their safe balance, though how the compensatory process is applied no one can say. Other species, and especially those belonging to the "hermit" group, weave a frail structure round the side of a drooping palm-leaf. The eggs are never more than two in number, quite white, and having both ends nearly equal. The solicitude for her offspring displayed by the mother is not exceeded by that of any other birds, but it seems doubtful whether the male takes any interest in the brood. (A. N.)

FOOTNOTES:

[1] In the edition of Oviedo's work published at Salamanca in 1547, the account (_lib._ xiv. cap. 4) runs thus: "Ay assi mismo enesta ysla vnos paxaricos tan negros como vn terciopelo negro muy bueno & son tan pequenos que ningunos he yo visto en Indias menores excepto el que aca se llama paxaro mosquito. El qual es tan pequeno que el bulto del es menor harto o assaz que le cabeca del dedo pulgar de la mano. Este no le he visto enesta Ysla pero dizen me que aqui los ay: & por esso dexo de hablar enel pa lo dezir dode los he visto que es en la tierra firme quado della se trate." A modern Spanish version of this passage will be found in the beautiful edition of Oviedo's works published by the Academy of Madrid in 1851 (i. 444).

[2] See also Morley's _Life of Girolamo Cardano_ (ii. 152, 153).

[3] Under this name Pliny perpetuated (_Hist. naturalis_, viii. 25) the confusion that had doubtless arisen before his time of two very distinct birds. As Sundevall remarks (_Tentamen_, p. 87, note), [Greek: trochilos] was evidently the name commonly given by the ancient Greeks to the smaller plovers, and was not improperly applied by Herodotus (ii. 68) to the species that feeds in the open mouth of the crocodile--the _Pluvianus aegyptius_ of modern ornithologists--in which sense Aristotle (_Hist. animalium_, ix. 6) also uses it. But the received text of Aristotle has two other passages (ix. 1 and 11) wherein the word appears in a wholly different connexion, and can there be only taken to mean the wren--the usual Greek name of which would seem to be [Greek: orchilos] (Sundevall, _Om Aristotl. Djurarter_, No. 54). Though none of his editors or commentators has suggested the possibility of such a thing, one can hardly help suspecting that in these passages some early copyist has substituted [Greek: trochilos] for [Greek: orchilos], and so laid the foundation of a curious error. It may be remarked that the crocodile of Santo Domingo is said to have the like office done for it by some kind of bird, which is called by Descourtilz (_Voyage_, iii. 26), a "Todier," but, as Geoffr. St Hilaire observes (_Descr. de l'Egypte_, ed. 2, xxiv. 440), is more probably a plover. Unfortunately the fauna of Hispaniola is not much better known now than in Oviedo's days.

[4] Thus _Docimastes ensifer_, in which the bill is longer than both head and body together.

[5] This is especially the case with the smaller species of the group, for the larger, though shooting with equal celerity from place to place, seem to flap their wings with comparatively slow but not less powerful strokes. The difference was especially observed with respect to the largest of all humming-birds, _Patagona gigas_, by Darwin.

[6] The resemblance, so far as it exists, must be merely the result of analogical function, and certainly indicates no affinity between the families.

[7] It is probable that in various members of the _Trochilidae_ the structure of the tongue, and other parts correlated therewith, will be found subject to several and perhaps considerable modifications, as is the case in various members of the _Picidae_.

[8] These are especially observable in _Rhamphodon naevius_ and _Androdon aequatorialis_.

[9] P. H. Gosse (_Birds of Jamaica_, p. 130) says that _Mellisuga minima_, the smallest species of the family, has "a real song"--but the like is not recorded of any other.

[10] _A Monograph of the Trochilidae or Humming-birds_, 5 vols. imp. fol. (London, 1861, with Introduction in 8vo).

[11] _Histoire naturelle des oiseaux-mouches, ou colibris_, 4 vols., with supplement, imp. 4to (Lyon-Geneve-Bale, 1874-1877).

[12] _Smithsonian Contributions to Knowledge_, No. 317, _A Classification and Synopsis of the Trochilidae_, 1 vol. imp. 4to (Washington, 1879).

[13] Salerne must be excepted, especially as he was rebuked by Buffon for doing what we now deem right.

[14] For example _Avocettula recurvirostris_ of Guiana and _A. euryptera_ of Colombia.

[15] The specific name of a species of Chrysolampis, commonly written by many writers _moschitus_, would lead to the belief that it was a mistake for _moschatus_, i.e. "musky," but in truth it originates with their carelessness, for though they quote Linnaeus as their authority they can never have referred to his works, or they would have found the word to be _mosquitus_, the "mosquito" of Oviedo, awkwardly, it is true, Latinized. If emendation be needed, _muscatus_, after Gesner's example, is undoubtedly, preferable.

HUMMOCK (of uncertain derivation; cf. hump or hillock), a boss or rounded knoll of ice rising above the general level of an ice-field, making sledge travelling in the Arctic and Antarctic region extremely difficult and unpleasant. Hummocky ice is caused by slow and unequal pressure in the main body of the packed ice, and by unequal structure and temperature at a later period.

HUMOUR (Latin _humor_), a word of many meanings and of strange fortune in their evolution. It began by meaning simply "liquid." It passed through the stage of being a term of art used by the old physicians--whom we should now call physiologists--and by degrees has come to be generally understood to signify a certain "habit of the mind," shown in speech, in literature and in action, or a quality in things and events observed by the human intelligence. The word reached its full development by slow degrees. When Dr Johnson compiled his dictionary, he gave nine definitions of, or equivalents for, "humour." They may be conveniently quoted: "(1) Moisture. (2) The different kinds of moisture in man's body, reckoned by the old physicians to be phlegm, blood, choler and melancholy, which as they predominate are supposed to determine the temper of mind. (3) General turn or temper of mind. (4) Present disposition. (5) Grotesque imagery, jocularity, merriment. (6) Tendency to disease, morbid disposition. (7) Petulance, peevishness. (8) A trick, a practice. (9) Caprice, whim, predominant inclination." The list was not quite complete, even in Dr Johnson's own time. Humour was then, as it is now, the name of the semi-fluid parts of the eye. Yet no dictionary-maker has been more successful than Johnson in giving the literary and conversational meaning of an English word, or the main lines of its history. It is therefore instructive to note that in no one of his nine clauses does humour bear the meaning it has for Thackeray or for George Meredith. "General turn or temper of mind" is at the best too vague, and has moreover another application. His list of equivalents only carries the history of the word up to the beginning of the last stage of its growth.

The limited original sense of liquid, moisture, mere wet, in which "humour" is used in Wycliffe's translation of the Bible, continued to attach to it until the 17th century. Thus Shakespeare, in the first scene of the second act of _Julius Caesar_, makes Portia say to her husband:--

"Is Brutus sick? and is it physical To walk unbraced and suck up the humours Of the dank morning?"

In the same scene Decius employs the word in the wide metaphorical sense in which it was used, and abused, then and afterwards. "Let me work," he says, referring to Caesar--

"For I can give his humour the true bent, And I will bring him to the Capitol."

Here we have "the general turn or temper of mind," which can be flattered, or otherwise directed to "present disposition." We have travelled far from mere fluid, and have been led on the road by the old physiologists. We are not concerned with their science, but it is necessary to see what they mean by "primary humours," and "second or third concoctions," if we are to understand how it was that a name for liquid could come to mean "general turn" or "present disposition," or "whim" or "jocularity."