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Rh into the West. The nomadic trait which induced migratory movements was acquired through necessity. The animals moved in herds. The Central West, for instance, was, when white men first saw it, covered largely with forests; between the forests were open spots covered with rank grasses. These "opens" were of various sizes from little patches surrounded by forests to great treeless expanses miles in length and breadth.

However large these open prairies, the herds of buffalo would in a short time exhaust the supply of grass and then troop on to fresher fields. Fires, grasshoppers, and drouth also tended to destroy the buffaloes' feeding-ground and to send them on long pilgrimages. Thus it is probable that in the day when the eastern portion of the United States was included in the habitat of the buffaloes, these animals were continuously trooping along over their great roadways throughout the summer, one herd after another, in search of fresh licks and springs.

The buffaloes migrated annually from the north to the south, and throughout their