ILLUSTRATIONS xvii 



83. Showing Two Types of Cotton Seed 215 



84. A Field of Upland Cotton in September 219 



85. Cultivating the Corn Field with a Weeder Before the Crop Has 



Come Up 230 



86. The Use of Two-row Riding Cultivators 231 



87. Cotton Cultivation with a Single-row Cultivator 232 



88. Production of Flaxseed in the World 240 



80. Distribution of Flax Production (Seed) in United States 241 



90. Flaxseed Balls 242 



90a. Distribution of Sorghums for Grains 



91. Sorghums and Sugar Cane Cut for Forage 



9 la. Head of Amber Sweet Sorghum 246 



92. Plant of Kafir Corn 247 



93. Non-saccharine Sorghums 247 



94. Sorghum Seeds 248 



95. Broom-corn Group of Sorghums 249 



96. Field of Selected Brown Kowliang 251 



97. Chart Showing Distribution of Potato Production in the World. . 256 



98. Chart Showing the Distribution of Potato Acreage in the United 



States 258 



99. Drawing in Diagram of Potato Flower, and Mature Seed Balls . . . 259 



100. Illustration of a Potato Plant, Showing Relation of the Above- 



ground Stem and Under-ground Stem 260 



101. Variety, Irish Cobbler, Representing the Early, Round, White- 



skinned Type 2(5 1 



102. Rural New Yorker, Representing the Oval-flattened Type of White- 



skinned Potatoes with Blue Sprouts 261 



103. Early Rose, Representing the Rose Group of Long, Pink or Red- 



skinned Potatoes with Rather Deep Eyes 202 



104. Russet Burbank, Representing the Medium Long Types of the 



Burbank Group '. 263 



105. Illustration Showing the Internal Structure of a Potato Tuber, 



and Relation to Structure of a Stem 265 



106. Intensive Potato Culture on a Long Island Farm, Under the 



"Skinner System" of Irrigation 269 



107. Comparing Tubers Sprouted in Strong Light and in Darkness. . . . 273 



108. A Good Type of Cultivator. The Rows Have Already Been Ridged 



with a Hiller 277 



10!). A Large Potato Digger 278 



110. A Dozen Plants, in a Good Field, Killed by the Disease Rhizoctonia 280 



111. A Power Sprayer That Will Spray Seven Rows at One Time 281 



112. Potato Affected with the Rot, Resulting from Late Blight 282 



113. A Good Field of Potatoes 283 



114. A Single Sweet Potato from the Hot-bed, Showing Many Young 



Sprouts 288 



1 15. Sweet Potato Leaf and Blossom 289 



116. Some Commercial Types of Sweet Potatoes 290 



117. Map Showing Range of Production of Sweet Potatoes 291 



1 1 8. Sweet Potato Plant Ready to Set in Field 294 



1 1 9. Transplanting Machine 295 



120. Special Plow, Fitted with Two Rolling Coulters for Digging Sweet 



Potatoes 296 



121. Storage Houses 298 



122. Sweet Potato Affected with Black Rot, and Plant Affected with 



Same Disease 299 



