In the later Stone Age the horse, too, is no longer merely a beast of the chase, but occurs also in the tame state. During the Drift the horse lived in herds all over Europe, North Asia, and North Africa. From this Drift horse comes the domestic horse now found all over the earth. Even the wild horses of the Drift exhibit such considerable differences from one another that, according to Nehring’s studies, these are to be regarded as the beginning of the formation of local breeds. The taming and domestication of the wild horse of the Drift, which began in the Stone Age, led to the domestic horse being split up later into numerous breeds. The old wild horse was comparatively small, with a large head; a similar form is still found here and there on the extensive barren moors of South Germany in the moss-horse, or, as the common people call it, the moss-cat. At the present day the genus of the domestic horse falls, like the ox, into two chief breeds--a smaller and more graceful Oriental breed, and a more powerful and somewhat larger Western breed with the facial bones more strongly developed. The horse of the later Stone Age of Europe exhibits only comparatively slight differences from the wild horse; it is generally a small, half-pony-like form with a large head, evidently also a stunted product of primitive breeding under comparatively unfavourable conditions. Two species extant in the Stone Age still live wild on the steppes of Central Asia at the present day; one of them also occurs as a fossil in the European Drift, although only rarely. That the ass occurred in the European Drift is probable, but not proved. It has not yet been found in the Neolithic Period of Europe. [Sidenote: Did the Horse come from Asia?] A survey of the palæontology of the domestic animals shows that they come from wild Drift species which--at any rate, as regards the ox, horse, and dog--are now extinct, so that these most important domestic animals now exist only in the tame state. Some of the domestic animals came from Asia, and, according to Von Zittel, were imported into Europe from there; this applies to the peat-ox and the domestic goat and pig. The Asiatic origin of the domestic horse and sheep is probable, but not proved; the sheep is found wild in South Europe as well as in Asia. The tarpan, a breed of horse very similar to the wild horse, lives in herds independent of man on the steppes of Central Asia. This has been indicated as being probably the parent breed of the domestic horse, and the origin of the latter has accordingly also been traced to Asia. One thing is certain: a considerable number of animal forms that co-exist with man in Europe at the present day--for instance, almost all the forms of our poultry and the fine kinds of pigs and sheep--have originally come from Asia. Our investigations show a similar state of things even in the Neolithic Period.