Within a century or so after the discovery of America, more than fifty new foods had been carried back to the Old World, including maize, turkey, white potato, pumpkin, squash, the so-called Jerusalem artichoke, avocado, chocolate, and several kinds of beans. (Potatoes and maize now rank second and third in total tonnage of the world's crops, behind rice but ahead of what is probably man's oldest cultivated grain, wheat.) The European has turned for relief to drugs and pharmaceuticals the Indians discovered: quinine, ephedrine, novocaine, curare, ipecac, and witch hazel.