12 Reading 3-1 squash is not so menacing as wild tobacco, but wild squash is very bitter. The bitterness may have been perceived as some kind of plant “power” worthy of respect and consideration. We shall never know what they thought, but it seems certain that a few squash vines had very little if any effect on the economy of the Indians who grew them. The activity could hardly have affected the food supply signi f cantly. If they were being forced into agriculture because of population pressure, they surely would not have taken 2000 yr to accomplish the job. A No-Model Model Every model proposed so far for agricultural origins or plant domestication has generated evidence against it. It is possible that some plants and animals were domesticated for ritual, magic, ceremony, or religious sacri f ce, but only a few out of hundreds of species could be so identi f ed. It is likely that a few cultigens did originate from dump heap weeds, but many show no such inclination. Some crops were derived from weeds and some weeds were derived from crops, but by far the more usual pattern is the crop-weed complex in which both crop and weed are derived from the same progenitors. Some crops arose in the Vavilovian
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