"That beasts possess a language, which enables them to communicate their ideas," says Thomas Gentry, "has been clearly shown. It is just as apparent that they can act upon the ideas so conveyed. We have now to see whether they can convey their ideas to man, and so bridge over the gulf between the higher and the lower beings. Were there no means of communicating ideas between man and animals, domestication would be impossible. Every one who has possessed and cared for some favourite animal must have observed that they can do so. Their own language becomes, in many instances, intelligible to man. Just as a child that is unable to pronounce words, can express its meaning by intimation, so a dog can do the same by its different modes of barking. There is the bark of joy or welcome, when the animal sees its master, or anticipates a walk with him; the furious bark of anger, if the dog suspects that any one is likely to injure himself or master, and the bark of terror when the dog is suddenly frightened at something which he cannot understand. Supposing, now, that his master could not see the dog, but could only hear his bark, would he not know perfectly well the ideas which were passing through the animal's mind?"

There is no doubt that animals understand something of our human language. They may not be able to comprehend the exact words used, but it is evident they get the meaning to a certain extent. I once had a small Mexican dog sent me from Mexico; he seemed not to understand what was said to him, until a friend called who spoke to him in Spanish, whereupon he showed his delight and became at once a friend to the man who spoke his own language.

The Rev. J. G. Wood tells the following incident, which forcibly illustrates the ability possessed by animals to commune with each other. "While I was living in the country with a friend, a most interesting incident was observed in the history of the dog. My friend had several dogs, of which two had a special attachment to, and an understanding with, each other. The one was a Scotch terrier, gentle and ready to fraternise with all honest comers. The other was as large as a mastiff, and looked like a compound between the mastiff and the large rough stag-hound. He was fierce, and required some acquaintance before you knew what faithfulness and kindness lay beneath his rough and savage-looking exterior. The one was gay and lively, the other, stern and thoughtful.

"These two dogs were often observed to go to a certain point together, when the small one remained behind at a corner of a large field, while the mastiff took a round by the side of the field, which ran up-hill for nearly a mile, and led to a wood on the left. Game abounded in those districts and the object of the dogs' arrangement was soon seen. The terrier would start a hare, and chase it up the hill towards the large wood at the summit, where they arrived somewhat tired. At this point, the large dog, who was fresh and had rested after his walk, darted after the animal, which he usually captured. They then ate the hare between them and returned home. This course had been systematically carried on some time before it was fully understood."

Every animal has a definite language which is quite sufficient to express the desires and emotions of its nature, and to make them intelligible, not only to its own species, but also to other animals and sometimes to human beings. Those which do not actually speak by means of a voice, make signs or mimic understood things so as to be perfectly intelligible. If animals had no language, they could not instruct their young. The young of animals in a civilised country are far wiser than the old ones in wild, uninhabited countries. This can be explained only by the knowledge which the young receive from their parents.

It is not uncommon for animals belonging to widely different species to speak the same language, and thus become great friends. A friend in Texas once owned a cow whose sole companion was a small black goat. One day the young goat followed the cow home from her grazing place, and from that time on they were constant companions, even occupying the same stall in winter, sharing the same food, and always sleeping near each other.

If one shoots a monkey in South Africa, and wounds it, allowing it to escape, there usually come droves of its kinspeople, screaming and chattering the most diabolical language, seeking to revenge the wrong done their tribe. Nothing demonstrates plainer that they have a common language; otherwise, how could they understand that one of their number had been wounded? It is because of the communication of ideas by a common language among animals that hunters so fear to allow a wounded animal to escape at the beginning of their hunting season in certain localities. A wounded bear who escapes, for example, will spoil the entire season for hunters by spreading the alarm among his people.

American Museum of Natural History, New York