Part 35
While young blood was thus supposed to give fresh vigour to the aged, the heat communicated by young persons to debilitated bedfellows was also resorted to. This practice seems to have been founded on observation. It is an acknowledged fact that an uncommon depression of vital power takes place in the young when such experiments are tried. This abstraction of vital power is frequently observed in young females married to very old men. In illustration of this fact, Dr. Copeland relates the following case: "I was a few years since consulted about a pale, sickly, and thin boy of about five or six years of age. He appeared to have no specific ailment; but there was a slow and remarkable decline of flesh and strength, and of the energy of all the functions,--what his mother very aptly termed 'a gradual blight.' After inquiring into the history of the case, it came out that he had been a very robust and plethoric child up to his third year, when his grandmother, a very aged person, took him to sleep with her; that he soon afterwards lost his good looks, and that he had continued to decline progressively ever since, notwithstanding medical treatment. I directed him to sleep apart from his aged parent, and prescribed gentle tonics, change of air, &c., and the recovery was very rapid."
This selfish indulgence of the aged in endeavouring to deprive their young bedfellows of heat and strength has been often remarked; and young women thus circumstanced have shrewdly suspected the cause of their debilitated condition. It is extremely probable that in these cases electricity is conducted from one body to another. This hypothesis is in some degree confirmed by the experiments made upon Casper Hauser by Von Feuerbach. This Casper Hauser had been kept from infancy until he was eighteen years of age in a perfectly dark cage, without leaving it, and where he never saw a living creature or heard the voice of man. He was restricted from using his limbs, his voice, his hands, or senses; and his food consisted of bread and water only, which he found placed by him when wakening from his sleep. When exposed in Nuremberg, in 1828, he was consequently at eighteen years as if just come into the world, and as incapable of walking, discerning objects, or conveying his impressions, as a newly born infant. These faculties, however, he soon acquired; and he was placed under an able instructor, who has recorded his singular history. Darkness had been to him twilight. The light of day was at first insupportable, inflamed his eyes, and brought on spasms. Substances, the odour of which could not be perceived by others, produced severe effects upon him. The smell of a glass of wine, even at a distance, occasioned headache; of fresh meat, sickness; and of flowers, a painful sensation. Passing by a churchyard with Dr. Daumer, the smell of dead bodies, although altogether imperceptible to the doctor, affected the young man so powerfully as to occasion shudderings, followed by feverish heat, terminating in a violent perspiration. He retained a great aversion, owing to their disagreeable taste and smell, to all kinds of food excepting bread and water.
When the north pole of a small magnet was held towards him, he described a drawing sensation proceeding outwards from the epigastrium, and _as if a current of air went from him_. The south pole affected him less, and he said it blew upon him. Professor Daumer and Hermann made several experiments of the kind, calculated to deceive him, and, even although the magnet was held at a considerable distance from him, his feelings always told him very correctly. These experiments always occasioned perspiration and a feeling of indisposition. He could detect metals placed under oil-cloths, paper, &c. by the sensation they occasioned. He described these sensations as a drawing, accompanied with a chill, which ascended, according to the metal, more or less up the arm, and attended with other distinctive feelings, the veins of the hand exposed to the metal becoming visibly swollen.
The variety and multitude of objects which at once came rushing upon his attention when he thus suddenly came into existence, the unaccustomed impressions of light, free air, and sense, and his anxiety to comprehend them, were too much for his weak frame and acute senses: he became dejected and enfeebled, and his nervous system morbidly elevated. He was subject to spasms and tremors, so that partial exclusion from external excitements became for a time requisite. After he had learned regularly to eat meat, his mental activity was diminished; his eyes lost their brilliancy and expression; the intense application and activity of his mind gave way to absence or indifference, and the quickness of apprehension became diminished. It may be questioned whether this alteration proceeded from the change of diet, or the painful excess of excitement that had preceded it.
Among the various doctrines regarding the creation of animals, that of _Panspermia_ was most ingenious and attractive. According to this theory, maintained by Anaxagoras and Heraclitus, all bodies contained the germ or the organic molecules necessary for their generation. Hippocrates favoured this idea, as plainly appears in his book _de Diaeta_; and in modern times Perrault, Gesik, Wollaston, Sturm, and other physiologists, have endeavoured to revive the doctrine, of which the organic molecules of Buffon and the living molecules of Ray were merely modifications. The expression in Genesis which sanctions the belief that the earth spontaneously germinated its productions, cannot be referred to the animal kingdom. Were this the case, similar animals would be found in every quarter of the globe. Spontaneous generation was also attributed to putrefaction; and Virgil describes the manner in which Aristaeus drew forth a swarm of bees from the corrupted entrails of a heifer. Pliny admits the spontaneous creation of rats, mice, frogs, and other small tribes of animals. These errors, however, were soon dispelled by the light thrown on the subject by the microscopic experiments of Valisneri, Swammerdam, Reaumur, and many other naturalists, who discovered sexual organs in all these supposed self-created individuals.
This doctrine was the foundation of the classification of the generative principle into _equivocal_ and _univocal generations_,--the former the effect of putrefaction, but which in reality was _univocal_, since it was soon ascertained that this production arose from the incubation of numerous eggs deposited by various insects and animalculi in these corrupted bodies. The following experiment afforded a convincing proof of the fact: A piece of meat was placed in an open vessel, and another in a vase hermetically closed; so soon as these animal substances entered into decomposition, myriads of insects pullulated in the exposed meat, whereas that which was protected from external agency remained free from this invasion.
It is a recognised fact that it is only through organized beings that organization can be transmitted; for how can corrupt substances, dead and deprived of vitality, give life to any organized matter? Generation is life; putrescence is death. By a law of nature, generation may be said ultimately to destroy the generative powers; a striking illustration of mortality, since life is transmitted at the expense of our very existence, and many individuals in the catenation of organized beings perish the very moment that they have tended to perpetuate their race. Death advances with rapid strides in the very ratio of the energies of life; and the surest method to attain longevity is to be sparing in the exercise of our exhausting faculties.
Et quasi vitai lampada tradunt.
_Latent_ or insensible life, such as that of the seeds of plants, or the animal enveloped in its egg, may last for a number of years, so long as they are able to germinate; here vitality is not worn out by relative life. Various species of the snail, the wheel-polybe, the tile-eel, and divers animalcules, have been kept apparently dead, and in the form of dried preparations, withered and hardened, for months and even years, but have afterwards been restored to life by the agency of warmth, moisture, and other stimulants. Snails have been thus reanimated after a lapse of fifteen years; and Bauer revived the _Vibrio tritici_, after an apparent death of five years and eight months, by merely soaking it in water. Adders have been found in hard winters not only completely frozen but absolutely brittle, yet have been restored to life when thawed. A shower of fragments of ice has fallen at Leicester, containing the horsehair eel, with the nuclei of a greater number. Colonel Wilks found eggs in the solid rocks of St. Helena susceptible of being hatched. The vitality in the seeds of plants is truly amazing; barley taken out of the bodies of mummies, Indian corn discovered in the tomb of a Peruvian Inca, and the bulb of an onion found in the hand of a mummy 3000 years old have been sown and have thriven luxuriantly. The most intense heat cannot destroy the vital property. The seeds of roasted apples, the kernels of baked prunes and boiled elder-berries have germinated. Sir John Herschel found that the _Acacia Lophanta_ lived after having been steeped in boiling water for twelve hours, and Ludwig informs us that the seeds of a species of cedar only germinated after ebullition. Fresh-water shells have been found in the thermal waters of Gastein at a temperature of 117 deg., and Niebuhr found a conferva growing in water at 142 deg. Raspberry-seeds taken from the corpse of an ancient Briton, contemporaneous with the Druids, have produced fruit when recommitted to the earth.
Some have endeavoured to explain the resurrection of the dead by these natural phenomena; forgetting that in these instances no corruption or actual disorganization had taken place. Stahl expresses himself in the following words when defining life: "Life is formally nothing more than the preservation of the body in mixture, corruptible indeed, but without the occurrence of corruption;" and in Junker we find, "What we call life is opposite to putridity."
The next theory attributed the principle of life to a subtle _gas_ or _aura_. This doctrine constituted one of the principles of the Epicurean philosophy, and was illustrated by Lucretius in his poem on the Nature of Things:
Nam penitus prorsum latet haec natura, subestque; Nec magis hac infra quidquam est in corpore nostro; Atque anima est animae proporro totius ipsa.
According to these notions, there existed a volatile principle that bore no specific name, but was diffused through every part of living bodies, more subtile than heat, air, or vapour. In later times this same gaseous agent received various appellations. Van Helmont designated it as the _aura vitalis_, while other philosophers called it the _aura seminalis_ and the _aura sanguinis_. The _archeus faber_ of Van Helmont, the _astrum internum_ of Crollius, the _principium energoumenon_ of Michael Alberti, the _substantia energetica naturae_ of Glisson, may all be referred to this unseen but powerful agency. Hippocrates called it [Greek: physis], or nature, which he elsewhere denominates [Greek: enoronta]. It was also the [Greek: dynamis xotike] of Galen. This soul, or breath, or spirit, directed and preserved the whole economy; and Chrysippus asserts that it acted like salt upon pork.
Modern chemistry has sought this principle in specific agents. Caloric, or the matter of heat; oxygen, or the vital part of atmospheric air, first discovered by Priestley, and explained by Lavoisier; and finally, the fluid collected by the Voltaic trough, were then considered as the principle of life. The experiments of Professor Galvani of Bologna, in which he produced the phenomena of life many hours after death, induced many physiologists to maintain that the identity that existed in galvanic electricity and the nervous influence, proved that this _aura_ was the creative agent in our economy.
The late experiments of Mr. Crosse seemed to show that insects were produced in silicate of potash under a long-continued action of voltaic electricity. Now whether this be really the case or not, it is grievous in the present enlightened age, to see these experiments and the assertions that resulted from them, denominated the work of atheism, and the labour of another Frankenstein!--I do not suppose for one moment that Mr. Crosse pretended to have discovered the power of imparting life, but merely of having developed a vital principle in substances supposed to be inorganic. Every experimentalist who thus develops the vital principle may be said to bestow life, without being exposed to the absurd charge of impiety.--The man who brings forth chickens from the incubation of eggs, instead of eating them; the physiologist who rots a piece of meat to develop myriads of living beings in the putrid nidus, might just as well be called an atheist.
While naturalists were thus groping in nature's dark labyrinth, endeavouring to account for the wonders of the _natura naturans_, that divinity of the Stoics that Lucan thus describes,
Superos quid quaerimus ultra? Jupiter est quodcumque vides, Jovis omnia plena,--
other wise men fancied that they had actually discovered the seat of life, which, according to their fanciful speculations, they had lodged in certain organs. The nervous system, the spinal marrow, the brain, the heart, were all and each of them considered in turn as the head-quarters of vitality; while the workshop of alimentation, or much-abused stomach, did not pass unnoticed and unhonoured. The heart of a turtle, and of some reptiles, has been seen contracting and dilating hours after its extraction from the body; the stomach has been excited into an action bearing some analogy to vomiting, when separated from the trunk; but all these curious phenomena, explained and accounted for (in some measure, at least) by physiology, do not tend to prove that any one organ, or any chain of organs, is possessed of separate vitality independent of the general principle of life. The brain, which has been regarded as the chief seat of this principle, is not always essential to life; for although man perishes, or at least his vital functions cease to act, when he is decapitated,[30] yet various birds and reptiles continue to live for hours and days after the head has been severed from the body, while we actually behold a regeneration of the head in the earth-worm. Moreover, we have upon record many cases of _acephalous_ children, or born without any head; and _anencephalous_ children who lived (for a short time, it is true) without any brains. Fontana removed the entire brain of a turtle, yet it lived six months, and walked about as before.
Sandiford had divided acephalous animals into three classes: the first, in which the head was wanting; the second, where other organs were also missing; and the third, where the foetus presented an unformed mass. In the acephalous twin described by Beclard, no liver, spleen, stomach, or oesophagus could be discovered, and the intestinal tube commenced at the superior extremity of the body. The infant had ten ribs on each side, and regular nerves arose from the spinal marrow. Although headless animals may not be gifted with intellectual faculties evident to our senses, yet they clearly live and feel. The zoophytes and polypes, without brains or heads, possess irritability and sensibility; they can seek their food, seize it, reject what is not edible, are susceptible of the powers of light and heat, can contract their fibres when touched or injured, and, in short, manifest various innate or instinctive powers. Gall has maintained that the passions resided in the brain, and, therefore, that brainless animals did not experience their influence. This is a bold assertion. Can he prove that worms, insects, zoophytes, that possess only what is called a ganglionic system, are strangers to instinctive fears and partialities? I apprehend that it will be found that passions belong to instinct much more than to our volition.
It is nevertheless true that animals may be killed by wounding the spinal marrow, by the process commonly called "_pitting_." This practice may be traced to high antiquity; and Livy informs us that when the Carthaginian troops were routed, Asdrubal ordered their unmanageable elephants to be destroyed by driving the point of a knife between the junction of the head and spine.
From these observations it will appear quite clear that life has no necessary connexion with sensation, although the latter cannot be experienced without the former. Vegetables are endowed with vitality; but we have no reason to suppose that they feel. It is also more than probable that, as the degree of intelligence decreases, the intensity of the corporeal feelings are also diminished. Did not this scale of sensibility exist, insects could not live under the supposed agonies that the entomologist daily inflicts. This supposition does not rest upon indefinite reasoning, for in our own race we observe that those parts which are gifted with a reproductive power are possessed of the smallest degrees of sensation; and the cuticle, the hair, the beard, and the nails will even grow after death. This fact may calm the apprehensions of those very humane persons who look upon experimental physiologists as very monsters of barbarity. Vaillant took out the intestines of a locust, and stuffed it with cotton, then fixed it down in his box with a pin, yet, five months after, the insect moved its feet and antennas. Spallanzani has shown that the snail can renew its head.
All this confusion in theories and wandering of the imagination have arisen from our confounding the vital principle, of which we know nothing, with the phenomena of sensation, for which patient and calm investigation may account. That there does exist a principle of life that animates, vivifies, and preserves all living bodies, until its powers cease, no one can deny; although to find out its nature is a vain pursuit, as idle as our endeavours to penetrate into the _causes of causation_. As Richerand observes, "its _essence_ is not designed to preserve the aggregation of our constituent molecules, but to collect other molecules, which, by assimilating themselves to the organ that it _vivifies_, may replace those which daily losses carry off, and which are employed in repairing and augmenting them; the word _vital principle_ is therefore not designed to express a distinct being, but denotes the _totality of powers alone_ which animate living bodies, and distinguish them from inert matter, the _totality of properties_ and _laws_ which govern the animal economy."
Of all the doctrines upon this abstruse subject (of which I have noticed the principal ones), that of the pre-existence of an organic germ appears the most plausible, or at any rate the easiest to conceive. It was from this conviction that the ancients held as an axiomatic principle _Omnia ex ovo_. It is upon this theory that Buffon rested his organic molecules, and Ray his vital globules. The primitive lineaments of organization may be traced in the egg, even before it is fecundated. The embryo that we find in its involucra is soft, flexible, ready to receive the plastic impression of the vivifying secretion,--the fecundating agency that imparts existence and all its wondrous attributes, to the pre-existing _ova_, the _ova subventanea_. It does not appear that the first organ of the embryo which exhibits the living principle is the heart, hence denominated in the foetus the _punctum saliens_; the principle of life has probably organized every molecule of the animal long before this supposed fountain of vitality had been seen to flow. It is more likely that the nervous system has received the first impressions imparted by the fecundating secretion, which the ancients supposed to have been a direct emanation from the brain, and bearing in its vivifying molecules the life of every part of the being it was about to organize; thus Valescus: "Sperma hominibus descendit ex omni corporis humore, qui fit ex subtiliori natura. Habet autem hoc sperma nervos et venas proprias attrahentes se a toto corpore ad testiculos--a membris disconditur principalibus--a corde, epate, cerebro mittuntur spiritus, ex quibus resultat spiritus informativus, et non aliter nisi cum spermate--ergo ab iis principaliter sperma disconditur."
Such were the doctrines on this curious subject until the days of Fabricius d'Acquapendente and Harvey. Buffon, however, exerted all his eloquence to revive the theory. The following are the notions of this elegant writer, who unfortunately only studied natural history in books and cabinets. He maintains that there exist two sorts of matter,--the one living, the other dead: the first enjoying a permanent vitality; the second universally spread, passing from vegetables to animals through the channels of nutrition, and returning from animals to vegetables through the medium of putrefaction,--thus in a constant state of circulation to animate living beings. This vital matter exists in determined quantities in nature, and is composed of an infinity of organic molecules, primitive, living, active, incorruptible, and in relation, both as regards action and numbers, with the molecules of light, and enjoying an immutable existence, since the usual causes of destruction can only affect their adherence. It is these molecules which, being cast in regular moulds, constitute all the organized bodies that surround us. According to this doctrine, _development_ and _growth_ are only a change of form operated by the addition of organic molecules; _nutrition_, the preservation of this form by the accession of fresh molecules that replace those that are destroyed; _generation_, the combination of these particles; and _death_, their separation from cohesion and association.
This ingenious system is not dissimilar to that of Maupertuis, who thought that the mysteries of generation could be explained by the usual laws of elective attraction. Various were the physical, metaphysical, and moral batteries raised against this visionary fabric. One single fact was sufficient to overthrow it. We constantly see parents deficient in a limb, or misshapen, producing perfect offspring; if each part of the economy was to transmit to its progeniture molecules similar to itself, the child would naturally be visited with the imperfection of the parent.
Notwithstanding these fallacies, we cannot but admit that chemical and molecular attraction constitute the principle that harmonizes all organized bodies. Generation is simply a function of organization and life. Organized bodies alone can generate. The living only can impart life. Animals and plants transmit to their descendants their several properties; and the inheritance of organization departs with the vital spark. Life is the property of no one; it is a transmitted heir-loom that never perishes; it resembles a torch that communicates an eternal flame while consuming itself. Organized beings have justly been considered the fuel of the universal vital fire, and we all are the _daily bread_ of that monstrous animal called _the world_. All are ingulfed in that vortex which Beccher has called the "_circulus aeterni motus_" Metempsychosis was simply an illustration of this fact recognised in all ages in the East, and taught in European schools by Pythagoras. Nothing perishes; and even combustion produces fresh combinations.
Poetical philosophy has considered _Love_ as the source and arbiter of _life_, and the _Venus Generatrix_ the fount of our existence. Lucretius recognises this power in the following lines:
Per te quoniam genus omne animantum Concipitur, visitque exortum lumina solis.
Then again,
Omnibus incutiens blandum per pectora amorem, Efficis ut cupide generatim saecia propagent.
Virey, a delightful French physiologist, seems to partake of this mythological opinion in the following passage: "L'amour est l'arbitre du monde organique; c'est lui qui debrouille le chaos de la matiere, et qui l'impregne de vie. Il ouvre et ferme a son gre les portes de l'existence a tous les etres que sa voix appelle du neant, et qu'il y replonge. L'attraction dans les matieres brutes est une sorte d'amour ou d'amitie analogue a celle qui reproduit des etres organises. Ainsi la faculte generative est un phenomene general dans l'univers; elle est representee par les attractions planetaires et chimiques dans les substances brutes, et par l'amour ou la vie dans les corps organises."