Closely connected with the real dwelling of primitive man, the cave, are two further phenomena that date back to earliest culture. As his constant companion, primitive man has a single animal, the _dog_, doubtless the earliest of domestic animals. Of all domestic animals this is the one that has remained most faithful to man down to the present time. The inhabitant of the modern city still keeps a dog if he owns any domestic animal at all, and as early as primitive times the dog was man's faithful companion. The origin of this first domestic animal remains obscure. The popular notion would seem to be that man felt the need of such a companion, and therefore domesticated the dog. But if one calls to mind the dogs that run wild in the streets of Constantinople, or the dog's nearest relative, the wolf, one can scarcely believe that men ever had a strong desire to make friends of these animals. According to another widely current view, it was man's need of the dog as a helper in the chase that led to its domestication. But this also is one of those rationalistic hypotheses based on the presupposition that man always acts in accordance with a preconceived plan, and thus knew in advance that the dog would prove a superior domestic animal, and one especially adapted to assist in the chase. Since the dog possessed these characteristics only after its domestication, they could not have been known until this had occurred, and the hypothesis is clearly untenable. How, then, did the dog and man come together in the earliest beginnings of society? The answer to this question, I believe, is to be found in the cave, the original place of shelter from rain and storm. Not only was the cave a refuge for man, but it was equally so for animals, and especially for the dog. Thus it brought its dwellers into companionship. Furthermore, the kindling of the fire, once man had learned the art, may have attracted the animal to its warmth. After the dog had thus become the companion of man, it accompanied him in his activities, including that of the chase. Here, of course, the nature of the carnivorous animal asserted itself; as man hunted, so also did the animal. The dog's training, therefore, did not at all consist in being taught to chase the game. It did this of itself, as may be observed in the case of dogs that are not specifically hunting dogs. The training consisted rather in breaking the dog of the habit of devouring the captured game. This was accomplished only through a consciously directed effort on the part of man, an effort to which he was driven by his own needs. Thus, it is the cave that accounts for the origin of the first domestic animal, and also, probably, for the first attempt at training an animal. But there is still another gain for the beginnings of culture that may probably be attributed to the cave in its capacity of a permanent habitation. Among primitive peoples, some of whom are already advanced