Reference was made at the close of the last article to the voice of the dog, and his method of making his feelings and desires understood. It is, of course, well known that this is an acquired habit, or accomplishment. In a state of Nature the dog does not even bark; he has acquired the art or knowledge from his companionship with man. Isaiah compares the blind watchman of Israel to dogs, saying, "They are dumb; they cannot bark." Again, to quote the argument of Dr. Gardiner: "The dog indicates his different feelings by different tones." The following is his yelp when his foot is trod upon.

Haydn introduces the bark of a dog into the scherzo in his 38th quartette. Indeed, the tones of the "voice" of the dog are so marked, that more than any other of the voices of Nature they have been utilized in music. The merest tyro in the study of dog language can readily distinguish between the bark of joy—the "deep-mouthed welcome as we draw near home," as Byron put it—and the angry snarl, the yelp of pain, or the accents of fear. Indeed, according to an assertion in the "Library of Entertaining Knowledge," the horse knows from the bark of a dog when he may expect an attack on his heels. Gardiner suggests that it would be worth while to study the language of the dog. Perhaps Professor Garnier, when he has reduced the language of the monkey to "A, B, C," might feel inclined to take up the matter.

Next to the dog there is no animal in which there is more variation of sound than in oxen: "Their lowing, though rough and rude, is music to the farmer's ear save one who moans the loss of her sportive young; with wandering eye and anxious look she grieves the livelong day." It is specially difficult in the case of oxen to suppose that they have a language; but it is impossible to doubt that the variations of their lowing are understood of one another, and serve to express their feelings if not their thoughts.

In the matter of exclamations, one knows how readily these may be imitated upon the violin, or in the case of the deeper or more guttural sounds, on the violoncello. The natural effect is greatly aided by the sliding of the finger along the note, especially in the case of the lowing of cattle; but there are other exclamations that are readily reduced to music. Gardiner gives one or two interesting cases, and the common salutation, "How d'ye do?" may be instanced. It usually starts on B natural, and the voice rising to D ends on C; whereas, the reply, "Pretty well, thank you," begins on D, and falling to A, ends again on D. After a few attempts on the piano, the reader will be able readily to form these notes for himself.