Plant-breeding; comments on the experiments of Nilsson and Burbank . s assumed by Darwin to Ijc the nearest relative ofthe hvpothetical ancestors of the whole group, since corn isthe only species in the family of the grains, which possessesnaked kernels. The pop corn is easily recognized by the small size ofthe kernels and ear and by the excessive proportion of thehornv or corneous endosperm, which, in the best varieties, isso well developed that it wholly excludes the starchy gives the property of popping, by which process thekernel is burst and the contents turned inside out. Th
Plant-breeding; comments on the experiments of Nilsson and Burbank . s assumed by Darwin to Ijc the nearest relative ofthe hvpothetical ancestors of the whole group, since corn isthe only species in the family of the grains, which possessesnaked kernels. The pop corn is easily recognized by the small size ofthe kernels and ear and by the excessive proportion of thehornv or corneous endosperm, which, in the best varieties, isso well developed that it wholly excludes the starchy gives the property of popping, by which process thekernel is burst and the contents turned inside out. Therice pop corns, with pointed kernels, are among the best-known races of this group. The flint corns have a well-developed starchy tissue en-closed by the horny endosperm. This latter varies in thick-ness with the varieties and causes the kernels to become toohard when dry for cattle to eat them without their beingground. Thence, the Latin name indurata. The dent corns, Zea ^lays indentata, are easily recog-nized by the indentation on their outer surface. This dc-. Fig. 33. A highly ramified cob of com115 ii6 PLANT-BREEDING prcssion is caused by the shrinkage of the starchy matterin drying. The dent varieties are almost the exclusive corncrop of the corn states and are of supreme value in the feed-ing of cattle; they are more numerous than all the varietiesof the five remaining groups taken together. The soft corns, Zea Mays amylacea, have no corneousendosperm, as their name indicates. The kernels, however,shrink uniformly and do not become wrinkled in group includes some of the oldest varieties, as, for in-stance, the mummy corns of Peru and Chile, and the verylargest-kerncled type, the Cusco. The sweet corns, or Zea Mays saccharata, are character-ized by their wrinkled and more or less translucent condition, however, is not caused by the horny part ofthe kernel, ]:)ut l^y the starchy tissue in which the starch isalmost wholly absent. It is replaced by a
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