. Cassell's natural history. Les animaux ; le comportement animal. 20 yATURAL HIHTORY. Le rugissement soudain cessé. Je me suis arrêté, tliinking qu'il était un homme, whicli prcpanng a été à l'avance sur moi. Mais j'ai écouté en vain-la bête s'était enfui. Lorsque j'ai atteint l'endroit je sav.- rien de cassé mais les branches des arbres. J'ai mesuré avec mon tliumb fjund, et les rameaux de cinq pouces de diamètre, brisé en deux par le puissant gi-ip de ce monstre de la forêt. Bien que déçue de ma cha.se, j'ai été heureux de trouver une corroboration de l'explication que je lui avait donné de l'usure des dents de devant l'animal, pour

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. Cassell's natural history. Animals; Animal behavior. 20 yATURAL HIHTORY. Suddenly the roaring ceased. I stopped, tliinking that it was a male, whicli was prcpanng to advance on me. But I listened in vain—the beast had fled. When I reached the spot I sav.- nothing but broken branches of trees. I measured some of them with my tliumb, and fjund boughs of five inches' diameter broken in two by the powerful gi-ip of this monster of the forest. Although disappointed in my cha.se, I was glad to find a corroboration of the explanation I had given of the wearing down of the animal's front teeth, for some of the branches plainly bore the tooth- marks." As the teeth of the Gorilla are admirably adapted for theii- duties of masticating and biting vegetable food, sometimes soft and sometimes hard, and as they resemble in number and general an-angement those of man, it is necessary to notice them briefly. They are of three kinds, the front ones, which bite when the jaw is moved up and dowai, the large eye teeth (or dog teeth), which pierce, and the back teeth, which crush and grind. The first-mentioned are called incisor teeth or cutters, and there are four in the upper and four in the lower jaw, as in man; the inner two in each jaw being. larger than the outer two. Tliey project slightly, and those of the upper jaw cut on the lower ones, and are, when the jaws are clenched, in front or " over-hung." In shape they are adapted for biting a piece out of anything, and they have one fang each, which fits into a socket in the jaw. In the upper jaw there is a space between the incisor teeth and the gi-eat eye or dog teeth. This is one of the mattei-s which distinguish the jaw of the Gorilla from that of man, whose teeth aj-e continued in a row without any spaces where the gum is visible between them. The cause of the space is that the lower eye tooth is so large and long that when the mouth is closed it fits in there. This space is called a " diastema, " and

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