The effect of advancing culture upon a dog has been gradually to decrease this ancient undifferentiated mode of expression afforded by howling and yelping, and to replace it by the much more speech-like bark. There is some doubt whether the dogs possessed by savages have the power of uttering the sharp, specialized note which is so characteristic of the civilized forms of their species. It is clear, however, that if they have the capacity of thus expressing themselves, they use it but rarely. On the other hand, our high-bred dogs have, to a great extent, lost the habit of expressing themselves in the ancient way. Many of our breeds appear to have become incapable of ululating. There is no doubt but this change in the mode of expression greatly increases the capacity of our dogs to set forth their states of mind. If we watch a high-bred dog, one with a wide range of sensibilities, which we may find in breeds which have long been closely associated with man, we may readily note five or six varieties of sound in the bark, each of which is clearly related to a certain state of mind. The bark of welcome, of fear, of rage, of doubt, and of pure fun, are almost always perfectly distinct to the educated ear, and this although the observer may not be acquainted with the creature; if he knows him well, he may be able to distinguish various other intonations--those which express impatience and even an element of sorrow. This last note verges toward the howl. It does not seem to me that we should regard barking as a new and useful invention; there are, indeed, few such in the organic world. The sound appears to me to have been derived from the primitive habit of howling. If we hearken to this utterance we perceive that it is not an unbroken sound, but is somewhat intermittent. At either end of the prolonged sound we can often notice that it is divided into rather distinct yelps more or less completely separated from the other notes. The cries of a dog when beaten often exhibit the same peculiarity; so, too, the puppy, before he has attained skill in barking, will often prolong each utterance in a way which makes its relation to the ancient mode of expression tolerably clear. At the risk of being deemed fanciful, I venture to suggest that the bark is in effect a division of the howl into clearly separated notes, the change having come about as a similar alteration is effected in our own speech, by the increase in the intelligence which the creature is called upon to express. I conceive that while the primitive and massive emotions found satisfying utterance in the long-drawn notes, the more divided state of mind of the humanized successor has led to a change in its utterances. Although these modifications of speech, if such we may term them, have probably been developed on the basis of the dog's human relations, there is, it seems to me, good reason to believe that the diversities in note have come to have a distinct conventional