cans and Peruvians, were in the middle-stage of barbarism. They lived in fortlike houses of adobe or stone, cultivated corn and other plants suitable to various conditions of localities and climate in artificially irrigated gardens that represented the main source of nourishment, and even kept a few tamed animals—the Mexicans the turkey and other birds, the Peruvians the llama. Furthermore they were familiar with the use of metals—iron excepted, and for this reason they could not get along yet without stone weapons and stone implements. The conquest by the Spaniards cut short all further independent development.
In the East, the middle stage of barbarism began with the taming of milk and meat producing animals, while the cultivation of plants seems to have remained unknown far into this period. It appears that the taming and raising of animals and the formation of large herds gave rise to the separation of Aryans and Semites from the rest of the barbarians. Names of animals are still common to the languages of European and Asian Aryans, while this is almost never the case with the names of cultivated plants.
In suitable localities, the formation of herds led to a nomadic life, as with the Semites in the grassy plains of the Euphrates and Tigris, the Aryans in the plains of India, of the Oxus, Jaxartes, Don and Dnieper. Along the borders of such pasture lands, the taming of animals must have been accomplished first. But later generations conceived the mistaken idea that the nomadic tribes had their origin in regions supposed to be the cradle of humanity, while in reality their savage ancestors and even people in the lower stage of barbarism would have found these regions almost unfit for habitation. On the other hand, once these barbarians of the middle stage were accustomed to nomadic life, nothing could have induced them to
