Part 7
When staying at Box Hill, near Dorking, I often saw the great apple snail, _Helix Pomatia_, which is only found on chalk soils, and is supposed to have been introduced by the Romans, from the quantities of their empty shells found with Roman remains in all parts of England. They were kept and fattened in places called "Cochlearia" and made into various "dainty dishes" which the Romans thought quite fit to set before their kings. It is certain that they are very nutritious creatures, and that in times of famine people have supported life and kept themselves mysteriously "fat and well-liking" by resorting to snails and slugs as articles of diet. Indeed I have heard more than once that the famous "Pate de Guimauve" owes its healing nutritive character to this despised univalve, which is said to enter largely into its composition. I brought several apple snails home with me from Box Hill and kept them for many years, until I really believe the creatures, in a dim sort of way, recognized me as their friend, or at any rate their feeder. I cannot boast, as I believe an American lady is said to have done, that "her tame oysters followed her up and down stairs," but certainly my snails would, when placed upon the lawn, very frequently crawl towards me, and would do so again and again when removed to a distance. As the weather became cold they always hibernated, closing the mouth of the shell with a thin, firm covering, or operculum, of chalk, which, mixed with their slime, made a substance like plaster of Paris. Thus enclosed they would lie as if dead until the warmth of the following spring made them push the door open and come out, with excellent appetites, ready to eat voraciously to make up for their long fast. These Roman snails were quite five inches long when fully extended, and therefore were much larger than our English species; the body was cream colour and the shell a pale tint of buff varying somewhat in different specimens.
These creatures were kept in a fern case with glass top and sides, and it was singular to observe the way in which they could suspend themselves (as shown in the drawing) from the top of the box.
The substance which exists in the caterpillar of the silkworm moth, and which can be drawn out into fine shreds of silk, is very similar to the slime of the snail, only in the latter it is not filiform, but exudes as a liquid and then hardens into a thin layer of silk which is strong enough to support the weight of two of these snails, for, seeing them one day thus suspended, I put them in the scales and ascertained that the weight of the two amounted to 2-1/2 ounces.
This mucus forms the glistening, shiny track which the snail leaves behind it, enabling it to glide easily and painlessly over rough substances which would otherwise lacerate its soft body.
One hardly expected to find social feeling and affection in animals so low down in the scale of nature, but I do not know what else could have led my "Romans" to caress each other with their long horns by the hour together and always keep close to one another, twisting and curling their yielding bodies round each other in the most odd contortions. Our English snails hibernate in whole colonies for the winter, which also points to their affectionate and gregarious habits.
In lifting up some moss I once came upon some yellow, half-transparent eggs about as large as pearl barley, and wishing to know what they would prove to be I kept them in damp moss under a tumbler for about a fortnight, when, to my dismay, I found a grand colony of yellow slugs! and not a little was I teased about these interesting young people. I am afraid I must own they were given as a _bonne bouche_ to my Virginian nightingale, who seemed highly to approve of this addition to his daily fare. Snails' eggs are nearly white and semi-transparent; the empty shells of young snails are very lovely when placed in a good microscope: the polariscope bringing out their exquisite prismatic tints.
The gardener one day brought in a testacella, or shelled slug. It fed upon earth-worms and was quite unlike the ordinary black or grey slug, of which we have, alas! countless thousands preying upon all the green things of the earth. This shelled slug was yellow, and seemed able to elongate its body very differently to any other species. The shell was quite small, a simple dome-shaped plate upon the anterior part of the body. I kept it for some weeks on damp moss under a tumbler, but it was often able to escape by flattening itself to a mere thread and then crawling under the rim of the tumbler, and at last I gave it liberty as a reward for its persevering efforts to obtain its freedom.
[Illustration]
[Illustration]
AN EARWIG MOTHER.
I had often read of the earwig as an incubating insect, and much wished to see for myself how she carried out her motherly instincts. One bright May morning found me busily turning over stones, clinkers, and old tree-roots in a fernery, which, having been long undisturbed, seemed a likely spot for the nest I wished to find. There seemed no scarcity of worms, wood-lice, centipedes, or beetles, but no earwigs could I see; and I was just about to give up the search when, lifting a piece of stone, I saw a small cavity, about as large as would contain a pea, and in it lay about twenty-six round, white eggs, hard-shelled and shining, of the size of a small pin's head. An earwig had placed herself over the eggs, and I was delighted to think at last I had lighted upon the insect mother I had been searching for. But what was to be done with her? How could I watch the process of incubation? The difficulty was solved by lifting the nest and its mother with a trowel and placing it in a saucer under a tumbler, without any displacement of the eggs; thus the mother's care could be conveniently watched. The earwig first carefully examined her new home, touching each morsel of earth and stone with her antennae; and, having ascertained the exact condition of things, she set to work to make a fresh nest, labouring with great industry until it was formed to her mind. She then took up the eggs, one by one, with her mandibles, and placed them in the new nest, arranging and rearranging them, until at last she seemed content, and remained either upon or near them for the rest of the day, quite motionless.
Every night, and sometimes two or three times in the day, she would form fresh places in the earth, and replace the eggs. To prevent the soil becoming too dry, I used to sprinkle a little water upon it--a drop here and there--and if by accident the water fell too near the eggs, the earwig became much excited, hurrying to and fro with her eggs, until they were all removed to a drier spot. On the other hand, if I omitted the water until the earth became dry, she would choose the dampest spot that remained in which to form her nest, and seemed to welcome the water-drops, drinking herself from them, and feeling the damp earth with her antennae. She remained thus for three weeks, feeding on little pieces of beef or mutton, or an occasional fly; I did not then know that earwigs are mostly vegetable feeders, but it is clear they can eat other food when needful. The first time I dropped a newly-killed house-fly near her she looked at it intently, felt it with her antennae, and then suddenly wheeled round and pinched it with her forceps, and being apparently satisfied that it could do no harm to her eggs, she began to devour it, and after an hour or two but little remained except the wings.
As it was early in the year, but few insects could be seen, but by searching in the conservatory I found a large green aphis, which I gave to the earwig. To my surprise, instead of devouring it at once, she applied herself to one of the projecting tubes of the aphis, and evidently sucked its sweet secretion, and enjoyed it as much and in the same way as ants are said to do. She feasted thus for four or five minutes, but I am sorry to add that, unlike the humane ants, who care tenderly for their aphides and preserve their lives by kind treatment, the earwig ended by munching up the unfortunate aphis, till not a trace of it was left.
At the end of three weeks I found one morning all the eggs were hatched, and tiny, snow-white earwigs, with forceps and antennae fully developed, were creeping about and around their mother. I placed a slice of pear in the saucer, upon which the little ones swarmed, and seemed to find it congenial food. In a few days they increased to nearly double their size when first hatched, and turned a light brown colour. Having ascertained all I wished to know about the maternal instincts of the earwig, I released the mother and her family, and no doubt she was happy enough to return to her old haunt in the fernery, and would greatly prefer tree-roots and stones to my tumbler-and-saucer arrangement.
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[Illustration: EGYPTIAN BEETLES.]
THE SACRED BEETLE.
On reading books on Egypt and the voyage up the Nile, one is sure to find some mention of the curious beetle which is found along the banks of the river, especially in Nubia, where the shore is traceried with the footprints of the busy little creature. Miss Edwards, in her very interesting book, "A Thousand Miles up the Nile," thus speaks of it: "Every one knows how this scarab was adopted by the Egyptians as an emblem of creative power and the immortality of the soul; it is to be seen in the wall-sculptures, on the tombs, cut out in precious stones and worn as an ornament, buried in the mummy-cases, and a figure of the beetle forms a hieroglyph, and represents a word signifying 'To be and to transform.' If actual worship was not paid to _Scaraboeus Sacer_,[1] it was, at any rate, regarded with the greatest reverence and a vast amount of symbolism drawn from its various characteristics."
[Footnote 1: Or _Ateuchus Sacer_.]
I had often wished to see this insect alive, and one day my wish was very unexpectedly gratified by the arrival of a small tin box in which I found a specimen of the sacred beetle swathed in wet linen like a veritable mummy, only, instead of being an Egyptian specimen, this had come from a kind friend at the Riviera, who knew that the same species existed there, and had sent me this one by post. The scarab was at once named "Cheops," and treated with all the respect due to his ancient family traditions.
His wants were easily supplied: a deep tin box, with earth and moss slightly damped, gave him space for exercise; and then for food--alas! that his tastes should be so degraded--he had to be supplied with cow-dung! This could be done in secret, and judiciously hidden by fair, green moss; but when exhibiting my cherished pet to admiring friends the first question was sure to be, "What does he feed upon?" and one had to take refuge in vague generalities about organic substances, &c., which might mean anything, and then, by diverting attention to some point of interest apart from the food question, the difficulty was generally overcome.
I kept a close watch to see if the beetle would be led by instinct to form its round pellets of mud as is its custom on the banks of the Nile, and having placed its egg in the centre, it begins to roll it from the margin of the river until it is above high-water mark. There it digs a hole and buries the pellet, leaving the sun to hatch the eggs in due time. Travellers who have watched the process describe the untiring way in which both the male and female beetle roll these pellets, often falling down with their burden into holes and ridges in the rough ground; but then their comrades will give them help, and, picking up the ball, they patiently labour on. Walking backwards, having the pellet between their broad hind legs, they push it up and up until it is placed in safety. The persevering energy of this insect led the Egyptians to adopt it as an emblem of the labours of their great deity, Osiris, or the sun; they also traced a resemblance in the spiny projections on its head to the rays of the sun.
Great was my delight to find at length that Cheops--even in captivity--was true to his native instincts, that he had formed a pellet about the size of a marble and was gravely rolling it with his hind legs backwards and forwards in his box. Poor captive! he was evidently puzzled what to do with the precious thing. He had no Nile bank to surmount, and the sun was hardly warm enough to encourage any hope for his future family; but he did the only thing that was possible--he set to work to scoop out a hole of sufficient size, then rolled the pellet in and covered it over with loose earth. Three such pellets were made at intervals of a few days; one of them I unearthed and kept as a curio. The beetle never seemed to miss it, and having done his duty under difficult circumstances, his mind seemed to be at rest.
I often placed Cheops in my hand to show him to visitors, and there he would lie feigning to be dead until he was gently stroked over the elytra, when he would stretch out his antennae, then his legs by slow degrees appeared (for he tucked them close to his body out of sight when frightened), and at last he would begin to walk in a jerky manner, as if moved by machinery, often stopping to look and listen to be sure that it was safe to move, and even if busily at work in the earth, if he saw any one coming near he would stop, draw in his antennae and limbs and remain motionless.
He had a strong and peculiar odour at times, which became more apparent if he was annoyed. He was infested with a small mite, and though these were frequently cleared away with water and a camel's-hair brush, they always reappeared in a day or two, clustering under the thorax between the first pair of legs, and at times they might be seen racing over his body with great rapidity. Once Cheops nearly escaped, for I had placed his box in the sun, and the warmth so excited and waked him up that he opened his wing-cases, used his gauze-like inner wings, and with a mighty hum was all but gone in search of his native land, but fortunately I was near enough to intercept his flight and place him in safe quarters. After keeping this curious creature in perfect health for sixteen months, I was much vexed to find him one morning lying in a shallow pan of water in his box, quite dead. He had overbalanced on to his back, and, being unable to turn over, had been drowned, though the water was scarcely half an inch deep. Poor Cheops is enshrined in a pyramid-shaped box, in which he is often shown and his life-history told to interested visitors.
[Illustration]
[Illustration: TRAP-DOOR SPIDERS.]
SPIDERS.
Of all the varieties of "creeping things" spiders seem to be the most universally disliked. I knew well the kind of expression I should see on the faces of my friends when I produced the box which contained my pet Tegenaria, a large black spider, long-legged and very swift, a well-known kind of house-spider.
Happily the box had a glass lid, so the inmate could be seen in comfort; and when the spider's history was told there was always an interest created in even this poor despised creature.
When first placed in its new home the Tegenaria began spinning tunnels of white silky web in various directions across the box. They were almost as close in texture as fine gauze, and had openings here and there, so that they formed a kind of labyrinth.
The spider always lived in one corner, curled up, watching for prey, and when a blue-bottle was put in, and began buzzing, she then rushed up one tunnel and down another until she could pounce upon her prey.
The fly was quickly killed by her poison fangs, and then carried to the corner to be consumed at leisure. Unlike the habit of the garden or diadem spider, no cobweb was rolled round the victim; only the wings were cut off and the body carried away. After some months I noticed the corner seemed filled up with web and fragments of insects, and when I examined it more closely there appeared a large round ball of eggs, over which the spider had spun some web, and then had collected all the legs and wings of her prey and stuck them carelessly here and there in the web so as to conceal her nest, and make it look like the remains of an old cobweb. Over this nest she kept careful watch. One could not drive her from it; she only left it for a moment to spring upon a fly, and would return with her food immediately and resume her watchful life in the corner. At length the young spiders were hatched in countless numbers; they crept about the tunnels, and though so minute as to be mere specks, they were perfect in form, active in seeking for prey, and appeared perfectly able to take care of themselves and begin life on their own account.
I had kept the Tegenaria more than a year in confinement, and having shown such admirable motherly instincts, I thought she had earned the reward of liberty. No doubt she welcomed "the order of release"! At any rate, she scampered away under some tree-roots, and possibly resides there with her numerous family to this day.
Spiders hunt their prey in a variety of ways--some by spinning their beautiful web, with which we are all familiar; others, as the Zebra spiders, catch flies by leaping suddenly upon them, and these may often be seen on window-sills watching some coveted insect, drawing slowly nearer to the victim, till, by a well-directed spring, it can be secured. There are nearly three hundred species of spiders in this country, and nearly all spin and weave their silken threads in some way, but each in different fashions, according to their mode of life. The female spider is the spinner, and her supply is about 150 yards. When she has used that amount a few days' rest will enable her to secrete a similar quantity.
With great pains the spider's silk has been obtained and woven into a delicate kind of material; but as each spider only yields one grain of silk, and 450 were required to produce one yard, the process was found to be impracticable. The insect possesses silk of two colours, silver-grey and yellow; one is used for the foundation-lines of the web, and the other for the interlacing threads. The silk is drawn by the spider from its four spinnerets, and issues from them in a soft, viscid state, but it hardens by exposure to the air. If a web is examined with a magnifying-glass, it will be seen that its threads are closely studded with minute globules of gum, which is so sticky that flies caught in the web are held in this kind of birdlime until the spider is able to spring upon them.