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 gorilla, who was so exclusive in his demeanour 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, if ever, be reconciled to human society; he does not imitate man nor yield to the influences of civilised life. One special trait of the gorilla which I wish to emphasise is that he is one of the most taciturn, if not quite the most, of any member of the simian family. This fact does not appear to confirm my theory as to their high type of speech, but it is a fact so far as I observed, although the natives say that they are 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 letters. There is one sound which Othello often used. It was not a speech sound, but a kind of whine, always coupled with a deep sigh. When left alone for a time he became oppressed with solitude. At such times he would heave a deep sigh and utter this strange sound. The tone and manner strongly appealed to the feelings of others, and while he did not appear to address it to any one or have any design in making it, it always touched a sympathetic chord, and I was sometimes tempted to release him. Another sound which was not within the pale of speech was a kind of grumbling sound. This frequently occurred when he was eating. It was not a growl in the proper sense, but was in a way a kind of complaint. Twice I heard this same sound made by wild ones in the forest near my cage. The only thing that I can compare it to in its use is that habit of a cat while eating, to make a peculiar growling sound, which appears to be done only when something else is near. It is possibly intended to deter others from trying to take the food. During my life in the cage I saw a number of gorillas, but I shall only describe a few of them, as their actions were similar in most instances.