x LIST OF ILLUSTRATIONS 



PAGE 



Structure of Cherry Blossom . 195 



Pollination and Fertilization . ' . 195 



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



Strawberry Blossoms . . . . . " . 198 



Pear Blossoms 198 



Leg of Bumblebee . . . . . . . . , . 202 



Bumblebee. Photograph by A. H. Verrill . . . . . .205 



Easter Lily ..* . 209 



Pear Leaf Blight. Redrawn from Galloway, . . . . .214 



Mushroom , * . . 215 



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

 Mycelium of Mold. Redrawn from Zopf . . . . . .217 



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



Potato Leaf affected with Late Blight. After Galloway . . . 220 



Spores on Leaf ........... 221 



Smut Sporidia . . , . . . ... . . . 226 



Oats Sinut . . .' .... . *. . . 227 



Corn Smut. Drawn 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 ..... . ., . . 248 



Potato Leaf affected by Early Blight. After Galloway . . . . 255 



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



P'ly 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 Life . . . . . . 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 



