Chapter 3

XII. HOW THE PLANT FEEDS FROM THE AIR 39

XIII. THE SAP CURRENT 40

XIV. THE FLOWER AND THE SEED 42

XV. POLLINATION 46

XVI. CROSSES, HYBRIDS, AND CROSS-POLLINATION 48

XVII. PROPAGATION BY BUDS 51

XVIII. PLANT SEEDING 59

XIX. SELECTING SEED CORN 66

XX. WEEDS 69

XXI. SEED PURITY AND VITALITY 72