DONACIA.
a, b. Larvæ, nat. size. c. Cocoons on root, nat. size.
d. Beetle, slightly magnified, e. Head of larva.
"What is this, papa," said Jack, "that I have found sticking to the roots of this water-weed; they look like the eggs of some creature?" They are not eggs, but the cocoons of a very common but pretty beetle called Donacia. See, I will slit one open with my penknife. There is the little animal inside, a white, fat, maggoty thing; it has two curious hooks at the end of the tail, it has only just framed its cell, and is about to change from the larval to the pupal state. Here you see are other maggots among the roots; they have not yet made a cocoon. I will open some more; here is one in its pupal condition. Here is another almost ready to come out as a beetle. The Donacia have all a metallic appearance and very beautiful they are, whether blue, red, copper, or purple; the under side is covered with a fine silky down. They are found in great numbers on water-weeds, and being very sluggish are readily caught or picked off the plants they frequent with the hand. Do you notice those small, flat, brown or black dabs so common on almost any water-weed you pluck up? These are planarian worms, and though not of prepossessing appearance generally, are extremely interesting animals to study. These large, reddish, oval or round cocoons are the eggs of the planariæ. Here is one of the largest of the family. It is of a milk-white colour, beautifully marked with delicate tree-like branches; sometimes this species (Planaria lactea) is of a light pink colour. The mouth is not situated where mouths usually are, in the fore part of the body, but almost in the centre. See, I will place this white planaria on my hand; do you notice that it protrudes something you might perhaps say was its tongue? It is not its tongue, however; it is a tubular proboscis, and is very strong and muscular, and unlike the soft body of the animal. By means of this proboscis the creature is enabled to pierce the bodies of other creatures and to suck out their juices. I have kept planariæ under observation, and seen them drive this proboscis through each other. These black and brown dabs often feed upon the milky planariæ. They are something like the hydræ in their power of producing lost portions of their bodies. Cut them in two or more pieces, each piece will grow into a perfect planaria again. These you see do not swim but crawl, or glide over the surface of plants in the water. Some kinds, however, different from these, are able to swim well. We have had a long and successful hunt to-day. Let us go.
WALK VII.
JUNE.
THIS morning, before we started for our walk, we went to look at a hedgehog which had been brought to us the preceding day. We discovered that the animal, in the course of the night, had crept into a bag with a quantity of bran in it, and that there were four little ones with her. There they were as snug as possible, the mother and little urchins! Very curious little animals too these young hedgehogs. The spines or prickles were nearly white and soft, and were not spread over the whole body, but arranged in rows down it. The appearance was that of a plucked duckling when it is what is called "penny." They were perfectly blind, and the passage of the ear was quite closed; they uttered faint, puppy-like cries. I was desirous to try and rear them; but I had grave doubts about the old one, for those who have attempted to rear young hedgehogs have generally found that the mother ate her offspring. We removed her, young and all, to another place, giving them plenty of straw and supplying bread and milk for the old one. Buffon, amongst others, relates "that he had repeatedly placed the mother with the young in a place of confinement; but that, instead of suckling them, she invariably killed and devoured them, notwithstanding that she was provided with plenty of food."
However, we determined to give our young urchins a chance, and hoped the mother hedgehog would be favorably disposed towards her offspring; so we now left her undisturbed. Willy wished to know whether hedgehogs were injurious creatures, for "you know, papa," he said, "that country lads and gamekeepers always kill them whenever they have a chance." I am convinced that hedgehogs do much more good than harm, by the destruction they cause to insects, slugs, snails, field-mice, and other pests of the farm. There is a foolish idea in the minds of the uneducated that these animals suck cows. You have only to laugh at such an absurdity; but I doubt you will scarcely ever succeed in persuading such people that the idea is a ridiculous one, and utterly unsupported by fact. Hedgehogs will undoubtedly destroy eggs, and one can understand why gamekeepers wage war against them, fearing for the safety of the eggs or young birds of their favorite partridges or pheasants. This is natural. I suspect, however, that hedgehogs seldom molest the nests, and that the injury they do in this respect is very small. "But you know, papa," said Jack, "that they will eat young birds. Do you not remember the dead sparrow we once gave to a hedgehog, and how furiously he went at it, and how soon he ate it all up except the feathers." "Yes," added Willy, "and do you not also remember our putting a toad in the same box with a hedgehog? Oh! how angry he seemed, and how savagely he shook the unfortunate toad! He did not, however, seem to like the flavour, and soon gave up the fight." Hedgehogs will certainly destroy young birds; but we must remember to set the good any animal does against the harm, and strike the balance; and, as I said, I suspect in this case the good will largely preponderate. Hedgehogs are extremely fond of beetles; they seize on them with great earnestness, and crack them with as much delight as you lads crack nuts. Hedgehogs are sometimes kept in houses for the purpose of eating the cockroaches so often abounding in kitchens. Snakes are also devoured by hedgehogs. The late Professor Buckland, having occasion to suspect that hedgehogs sometimes preyed on snakes, "procured a common snake and also a hedgehog, and put them in a box together. Whether or not the latter recognised its enemy was not apparent; it did not dart from the hedgehog, but kept creeping gently round the box. The hedgehog was rolled up, and did not appear to see the snake. The professor then laid the hedgehog on the snake, with that part of the ball where the head and tail meet downwards, and touching it. The snake proceeded to crawl; the hedgehog started, opened slightly, and seeing what was under it gave the snake a hard bite, and instantly rolled itself up again. It soon opened a second, and again a third time, repeating the bite. This done, the hedgehog stood by the snake's side, and passed the whole body of the snake successively through its jaws, cracking it, and breaking the bones at intervals of half an inch or more, by which operation the snake was rendered motionless. The hedgehog then placed itself at the tip of the snake's tail, and began to eat upwards, as one would eat a radish, without intermission, but slowly, till half of the snake was devoured. The following morning the remaining half was also completely eaten up." When rather young these animals make very interesting pets; they soon become tame, and will allow you to stroke their cheeks. You remember our placing a hedgehog on the study table, and seeing how it got off on to the ground. It came to the edge, and threw itself off, coiling up its body partly as it fell; the elastic nature of its prickly covering enabling it to bear the shock of the fall without the slightest inconvenience.
