CULTIVATED PLANTS: CEREAL AND CULINARY PLANTS.
PRELIMINARY REMARKS ON THE NUMBER AND PARENTAGE OF CULTIVATED PLANTS--FIRST
STEPS IN CULTIVATION--GEOGRAPHICAL DISTRIBUTION OF CULTIVATED PLANTS.
CEREALIA--DOUBTS ON THE NUMBER OF SPECIES--WHEAT: VARIETIES OF--INDIVIDUAL
VARIABILITY--CHANGED HABITS--SELECTION--ANCIENT HISTORY OF THE VARIETIES--
MAIZE: GREAT VARIATION OF--DIRECT ACTION OF CLIMATE ON.
CULINARY PLANTS--CABBAGES: VARIETIES OF, IN FOLIAGE AND STEMS, BUT NOT IN
OTHER PARTS--PARENTAGE OF--OTHER SPECIES OF BRASSICA--PEAS: AMOUNT OF
DIFFERENCE IN THE SEVERAL KINDS, CHIEFLY IN THE PODS AND SEED--SOME
VARIETIES CONSTANT, SOME HIGHLY VARIABLE--DO NOT INTERCROSS--BEANS--
POTATOES: NUMEROUS VARIETIES OF--DIFFER LITTLE EXCEPT IN THE TUBERS--
CHARACTERS INHERITED.