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Rh the rabbit was an important item, and as noted above, salmon were caught wherever they made "runs," and other fish were used when available. Likewise, the coast people depended to some extent upon the marine fauna. Thus, notwithstanding the popular idea of modern California as an ideal habitat for us modern Americans, it must be regarded as rather unfavorable to the development of primitive tribes, for while enough food could be found, the daily routine of gathering it in small bits was time-consuming in the extreme. Moreover, in parts of Nevada, Utah, and Idaho the margin of even this sort of food was so narrow that many species of insects were eaten.

There are just two cultivated native food plants, maize and manioc (cassava), that rise to the level of chief staples. Both take the highest rank in excellence among the world's foods, and after the epoch-making discovery of Columbus were quickly spread to other parts of the world. The uniqueness of these plants and the sharp contrast they make when compared with the cultivated staples of the Old World, is the strongest possible argument for the independent development of American culture.

In the first place, we have a distinct agricultural area in the eastern half of the United States, including a very small section of Canada. The chief crop was maize, on which account we speak of this division as the eastern maize area. Although its contact with the great agricultural area of Mexico and the South is slightly broken in Texas, we have no reason to doubt a historical connection between the two areas, and consequently we may consider them as parts of the same whole. The remaining inland boundaries of this eastern maize area mark the approximate climatic limits to its growth. These limits also define the distribution of agriculture, from which we have reason to infer that the introduction of that art did not precede the introduction of maize culture. However, this is a problem to be discussed later. We see, then, that the Indian tribes had extended agriculture in the East to its physical limits. The stretch of country from Louisiana to Maine