I have hitherto referred only to the _limbs_ of animals; I will now go further. I had a beautiful little monkey on board my ship. By accident it was crushed, and received such injury that the backbone was divided at the loins, and the vertebra of the upper part protruded an inch outside of its skin. Such an accident in a man would have produced immediate death; but the monkey did not die; its lower limbs were of course paralysed. The vertebra which protruded gradually rotted off, and in six weeks the animal was crawling about the decks with its fore feet. It was, however, such a pitiable object, that I ordered it to be drowned. Now, if we descend lower down in the scale until we come to the reptiles and insects, we shall find not only that the loss of limbs is not attended with death, but that the members are reproduced. Let any one take a spider by its legs, it will leave them in your hands that it may escape. Confine the animal under a glass, and in a few weeks it will have all its members perfect as before. Lizards are still more peculiar in their reproduction. I was at Madeira for many months, and often caught the lizards which played about the walls and roofs of the out-houses; and if ever I caught a lizard by the tail, he would make a spring, and leave his tail in my hand, which seemed to snap off as easily as would a small carrot. Now the tail of the lizard is longer than its body, and a continuation of the vertebrae of the back. I soon found out that lizards did not die from this extensive loss, but, on the contrary, that their tails grew again. Even the first week afterwards, a little end began to show itself, and in about two months the animal had reproduced the whole. What I am about to say now will probably be considered by some as incredible; they are, however, at full liberty to disbelieve it. One day I was looking out of the window with the late Tom Sheridan, who lived in the same house, and we observed on the roof of the out-house a lizard with two tails, but neither of them full grown; and we argued that, at the time the animal lost his tail, he must have suffered some division of the stump. Being at that time a naturalist, i.e. very cruel; I immediately caught a lizard, pulled off his tail, notched the vertebra, and turned him loose again. Our conjectures were right; the animal in two or three weeks had two tails growing out like the one we had seen. I repeated this experiment several times, and it always appeared to succeed; and all the two-tailed lizards were called mine. Now this power of reproduction increases as you descend the scale; as an instance, take the polypus, which is as near as possible at the bottom of it. If you cut a polypus into twenty pieces, without any regard to division, in a short time you will have twenty perfect polypi. Now the deductions I would draw from these remarks are-- That the most perfect animals are least capable of reproduction, and most sensible of pain.