value between the individuals of all the different breeds. Any one who closely observes these animals must have noticed the fact that the degree of attention they give to the utterances of their kindred varies in a way which indicates that they have great varieties of denotations. Some of the shades of the meaning which a dog's bark has to others of his species probably escape our less fine ears. The creation of something like a language among our civilized dogs has naturally been accompanied by the development of an understanding of human speech. Although we cannot attach much importance to the mass of anecdote on this point, there is enough which is well attested--sufficient, indeed, which has come within the limits of my own observation--to make it clear that dogs, even without deliberate teaching, frequently acquire a tolerably clear understanding of a number of words and even of short phrases. They will catch these not only when given in distinct command, but when uttered in an ordinary tone, without any sign that they relate to their affairs. It is true that these understood words generally relate to some action which the dog is accustomed to perform, yet there are instances so well attested that they deserve credit, which seem to show that the creatures can get some sense of the drift of conversation even when it is carried on by persons with whom they are not familiar and does not clearly relate to their own affairs. It should be observed that within the narrow limits of this essay little or no effort has been made to interpret the state of mind of dogs from the vast but rather untrustworthy mass of anecdote with which our books are filled. So large a part of this evidence is contaminated by prepossessions, and a yet larger part is so unverified in any scientific sense, that for purposes of sound inquiry it is worthless. It therefore seems best to limit ourselves, as has been done in this paper, to those general actions of the creatures which are matters of common knowledge and safely beyond question. From these indices we are able to determine a basis for some important conclusions. These are in effect as follows, viz.: Our domestic dog is derived from a species, one or more, akin to the wolf, the jackal, and the fox; to a group of animals not characterized by great native intelligence, but distinguished for their ferocity and their general untamableness. There is no reason to believe that the primitive dog had any more foundation for his great attainments than his obstinately savage kindred, except that he may have had a greater disposition to form an attachment to a master. We can hardly believe that he had any share of that marvellous sympathy with man and understanding of his motives which characterize the high-bred varieties of his species. All this vast transformation, which from a psychological point of view has carried the dog relatively as far up above his origin as civilization has lifted man above his lowest