xiv ILLUSTRATIONS 



FIG. PAGE 



21 Three Favorite Shapes of Potatoes 79 



22 Potato Plant, Showing Upright Haulm 80 



23 Potato Plant, Early Variety, Showing Dwarf Haulm 92 



24 The Modern Method of Planting Potatoes .... 98 



25 Planting by Hand 99 



26 Sectional View of the Aspinwall Potato Planter . . 100 



27 Aspinwall Potato Planter (Side View) 101 



28 The Robbins Improved Planter 103 



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 no 



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 145 



44 The Hoover Digger 146 



45 Potato Shovel 147 



