When I returned to my cage Moses proceeded to investigate the new ape. He approached slowly and cautiously within about three feet of it. He walked around the gorilla a couple of times, keeping his face towards it, and gradually getting a little nearer. At length he came up within a few inches of one side of the gorilla and stopped. He stood almost on tiptoe, with only the ends of his fingers touching the ground. The gorilla continued to eat his food without so much as giving Moses a look. Moses placed his mouth near the ear of the gorilla and gave one terrific yell. The gorilla did not flinch or even turn his eyes. Moses stood for a moment looking as if in surprise that he had made no impression. After this time he made some friendly overtures to the gorilla, but the latter did not entertain them with favor, beyond maintaining terms of peace. They never quarreled, but Othello always treated Moses as an inferior. I do not know if he entertained a real feeling of contempt, but his manner was haughty and condescending. There were but few articles of food that he and Moses liked in common, and, therefore, they had no occasion to quarrel; but they never played together or cultivated any friendly terms, as the chimpanzees did among themselves. This may have been due to the fact that the gorilla was so exclusive in his demeanor towards the chimpanzee as to forbid all attempts of the latter to become intimate. The chimpanzee by nature is more sociable and is fond of human society. He imitates the actions of man in many things and quickly adapts himself to new conditions, while the gorilla is selfish and retiring. He can seldom be reconciled to human society. He does not imitate man nor readily yield to the influence of civilization. One special trait of the gorilla which I wish to emphasize is that he is one of the most taciturn of all the family. This fact does not confirm my theory as to their faculty of speech; but it is a fact, so far as I observed, although the natives say that he is as loquacious as the chimpanzee. Among the specimens that I have studied, both wild and in captivity, I have never heard but four sounds that differed from each other, and of these only two could properly be defined as speech. I do not include the screaming sound described in another chapter. I have not been able, so far, to translate the sounds that I have heard, and they cannot be spelled with our letters.