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ILLUSTRATIONS

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Spraying in a New York Potato Field . Frontispiece 2 Copy of Engraving of the Virginian Potato from

Gerard's “Herbal,” 1636 . . . . . . . . . 3 Sectional View of Potato Flower . . . . . . . 4 Tuber, Showing the Arrangement of the Eyes .. 5 Potato Plant, Showing Tubers (Viewed from Above) 6 Potato Plant, Showing Tubers and Roots (Side View) 7 A Useful Type of Spring-tooth Harrow. .... 8 A Disk Harrow. . . . . . . . . . . . . . 9 A Double-action Cutaway Harrow . . . . . . . 10 The Influence of Lime Upon Potatoes ..... 11 Potato Tray for Storing and Sprouting Seed . . 12 Potato Planted Four Inches Deep, Showing its

Growth and Development of Tubers . .... 13 Seed Potatoes Sprouted for Use in the Planter .. 14 Seed of Early Potatoes, Sprouted for Hand Planting 15 Seed Potatoes, Showing Weak, Long Sprouts. .. 16 Diagram, Showing the Stand of Twenty Plats of

Carman No. 3 Potatoes. ......... 17 Diagram, Showing the Stand of Thirty-six Plats

. of Early Trumbull Potatoes . . . . . . . . 18 Section of a Tuber of Poor Cooking Quality ... 19 Section of a Tuber of Good Cooking Quality. .. 20 Three Varieties Differing in the Character of Net

ting of the Skin . . . . . . . . . . .

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FIG. 21 Three Favorite Shapes of Potatoes . . . . . . 22 Potato Plant, Showing Upright Haulm ..... 80 23 Potato Plant, Early Variety, Showing Dwarf Haulm 92 24 The Modern Method of Planting Potatoes . .... 25 Planting by Hand . . . . . . . . . . . . . 99 26 Sectional View of the Aspinwall Potato Planter. . 27 Aspinwall Potato Planter (Side View) ....: 28 The Robbins Improved Planter , i..... 29 Platform of the Robbins Improved Planter ..104 30 Halleck Expansible Weeder . . . . . . . . . 107 31 Five-tooth Cultivator, with Hiller Attachment . . 108 32 A Useful Two-horse Cultivator . . . . . . . . 109 33 One-horse Spring Tooth Cultivator ...... 34 Section of Potato Leaf, Showing the Parts and

Mycelium of Blight (Phytophthora infestans) . . 114 35 Maturation of a Spore Sac and Germination of a

Spore of Rot (P. infestans) ........ 115 36 Longitudinal Section of a Potato Stalk, Showing a

Germinating Spore of Rot (P. infestans). ... 116 37 The Germinating Tube of a Spore of Rot (P. infes

tans) on a Leaf . . . . . . . . . . . . . 117 38 Tubers with and without Scab ........ 120 39 The Cucumber Flea-beetle (Crepidodera Epitrix cucu

meris) ................ 123 40 Leaflet of Potato, Showing Over a Hundred Holes

Made by Flea-beetles .......... 123 41 Sprayed and Unsprayed Portions of a New York

Potato Field . . . . . . . . . . . . . . 133 42 A Suggestive English Spraying Machine . . . . 140 43 The Reuther Potato Digger ......... 44 The Hoover Digger ............ 146 45 Potato Shovel . . . . . . . . . . . . . . 147

145 FIG.

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46 Storing Potatoes in Pits .......... 148 47 Showing the Distribution of Potato Production in

the United States in 1899 ......... 154 48 Showing the Distribution of the Area in the United

States in Potatoes in 1899. ........ 155 49 Grading and Barreling Potatoes for Market ... 163 50 Potato Flower, with Calix and Corolla Removed,

Showing Anthers and Stigma . . . . . . . 173 51 Pistil of Potato Flower, Showing Parts . . . . . 174

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