X LIST OF ILLUSTRATIONS 



PAGE 



Structure of Oierry Blossom 195 



Pollination and Fertilization 195 



Cucumber Flowers. After Drawing by James Hall .... 196 



Strawberry Blossoms 198 



Pear Blossoms ........... -198 



Leg of Bumblebee 202 



Bimiblebee. Photograph by A. H. Verrill ... . . 205 



Easter Lily 209 



Pear Leaf Blight. Kedrawn from Galloway. . . . .214 



Mushroom . . . . . ■ . ■ ■ I ■ • ^'5 

 Mushroom Spawn. Drawn from. Photograph by Atkimon . . .216 



Mycelium of Mold.' Redrawn from Zopf 217 



A Dying Mushroom .......... 218 



Potato LeaPaflFected with Late Blight. After Galloway . . . 220 



Spores on Leaf 221 



SmutSporidia 226 



Oats Smut 227 



Corn Smut. Draiun from Photograph by Selby 228 



Spore Germinating : seen from Above. Redrawn from R, E. Smith . 232 



Spore Germinating : seen from Side. Redrawn from R. E. Smith . 232 



Black Knot on Wild Cherry ......... 243 



Apple Scab 245 



Apples dwarfed by Scab. Redrawn from Chester 246 



Apples affected by Bitter Rot. From Scott, U. S. Department of Agri- 

 culture ............ 247 



Brown Rot Spores Developing 248 



Brown Rot Spores Germinating ........ 24S 



Potato Leaf affected by Early Blight. After Galloway .... 235 



Bee's Claw with Blight Bacteria. After Whetzel and Stewart . . 260 



Fly with Fungus ........... 273 



Soy Bean Root showing Tubercles. From Hopkins .... 277 



Red Clover: Effect of Bacteria. Drawn from Photograph by Hopkins 279 



The White-throated Sparrow. After Biological Survey . . . 284 



Tent Caterpillar Nest attacked by Birds 287 



May Beetle. From Harris . . 291 



Click Beetles. From Harris 292 



Meadow Grasshopper. From Harris 293 



Screech Owl. Photograph from Lift 294 



Prairie Dog Burrow : Sectional View. After Merriam . . . 306 



Field or Meadow Mouse. After Samuels ... . . 312 



Wild Morning-glory Roots. Drawn from Photograph by Lantz . . 314 



