ILLUSTRATIONS 



FIG. PAGE 



Spraying in a New York Potato Field . Frontispiece 



2 Copy of Engraving of the Virginian Potato from 



Gerard's " Herbal," 1636 2 



3 Sectional View of Potato Flower 4 



4 Tuber, Showing the Arrangement of the Eyes . . 6 



5 Potato Plant, Showing Tubers (Viewed from Above) 12 



6 Potato Plant, Showing Tubers and Roots (Side View) 13 



7 A Useful Type of Spring-tooth Harrow 22 



8 A Disk Harrow : 23 



9 A Double-action Cutaway Harrow 24 



10 The Influence of Lime Upon Potatoes 36 



11 Potato Tray for Storing and Sprouting Seed ... 53 



12 Potato Planted Four Inches Deep, Showing its 



Growth and Development of Tubers ..... 55 



13 Seed Potatoes Sprouted for Use in the Planter . . 56 



14 Seed of Early Potatoes, Sprouted for Hand Planting 56 



15 Seed Potatoes, Showing Weak, Long Sprouts ... 57 



16 Diagram, Showing the Stand of Twenty Plats of 



Carman No. 3 Potatoes 68 



17 Diagram, Showing the Stand of Thirty-six Plats 



of Early Trumbull Potatoes 68 



18 Section of a Tuber of Poor Cooking Quality ... 72 



19 Section of a Tuber of Good Cooking Quality ... 73 



20 Three Varieties Differing in the Character of Net- 



ting of the Skin 77 



xiii 



