Only two animals have entered the human household otherwise than as prisoners and become domesticated by other means than those of enforced servitude: the dog and the cat. Two things they have in common, namely, that both belong to the order of carnivores and both serve man in their capacity of hunters. In all other charac teristics, above all in the manner of their association with man, they are as different as the night from the day. There is no domestic animal which has so radically altered its whole way of living, indeed its whole sphere of interests, that has become domestic in so true a sense as the dog: and there is no animal that, in the course of its century-old association with man, has altered so little as the cat. There is some truth in the assertion that the cat, with the exception of a few luxury breeds, such as Angora, Persians, and Siamese, is no domestic animal but a completely wild being. Maintaining its full independence it has taken up its abode in the houses and outhouses of man, for the simple reason that there are more mice there than elsewhere.