Carl Ernst Otto Kuntze, Popular Science Monthly (1879)
“ We have, therefore, no reason to doubt that the very early ancestors of the Indians, however barbarous they may have been, cultivated a plant the culture of which is very easy and whose produce is most abundant, for it yields, as Humboldt has shown, on the same area, twenty-five times as large a crop and twenty-five times as much food-value as wheat. ”
