ILLUSTRATIONS 



FIQ. PAGE 



Wheat, the Staff of Life, as Grown in the Great Plains of Nebraska 

 Frontispiece 



1. Diagram Illustrating the Relative Proportion of Dry Matter and 



Water in a Green Plant 6 



2. Root-hairs 8 



3. Diagram Illustrating the Assimilation of Food Materials by a Plant . . 10 



4. Germination in Corn 15 



5. Wheat Grain in Three Stages of Germination, on the First, Second and 



Third Days after Being Placed in Germinator 16 



6. Gerniinator Made by Inverting a Glass Tumbler on a Glass Plate; 



Also One Made with Two Plates and Blotting Paper 18 



7. A Box Germinator 19 



8. Germinating Oats and Barley 21 



9. Early Development of Wheat Plant 22 



10. Comparative Study of Spikelets ' . 24 



11. Diagram of a Wheat Flower 25 



12. Ovary of Wheat Grain 25 



13. Diagram of a Corn Kernel to Show the Four Principal Parts 26 



14. Plowing Under Rye for Green Manure 33 



15. Distribution of Corn Production in the United States 42 



16. Coyote Corn, a Form Found Growing Wild in Mexico 44 



17. Six Principal Types of Corn 45 



18. Kernels of Principal Types of Corn 46 



19. Ear of Corn in Full Silk, and Ready to be Fertilized 50 



20. Method of Preparing a Laboratory Exercise, and also Showing in 



Detail the Male and Female Flowers of Corn 51 



21. Corn Plant Prepared for Artificial Crossing 52 



22. Effect of Crossing and Self -Fertilization on Vigor of Plants 53 



23. Stalk of Prolific Corn, Leaves Removed to Show Ears 59 



24. Difference in Types of Corn 60 



25. Two Types of Learning Corn Developed by Six Years' Selection at the 



Illinois Experiment Station 61 



26. A Box Tester for Seed Cora. 63 



27. Wheat Plant Illustrating the Principle That Permanent Roots Always 



Develop at About the Same Depth, Whether the Seed Is Planted 



Deep or Shallow 70 



28. Two-row Cultivator, for Listed Corn, at Work 75 



29. Drawing Showing the Distribution of Corn Roots in the Soil 78 



30. Harvesting Corn by Hand 81 



31. Harvesting Corn with a Corn Binder 82 



32. An Ideal Ear of Dent Corn of Fancy Type 94 



33. Shape of Ear 95 



34. Tips of Ears 98 



35. Butts of Ears 98 



36. Shape of Kernels 99 



37. Shallow, Medium and Deep Kernels. Large Shank, Medium, and 



Too Small 100 



38. A Well-selected Exhibit of Fancy Ears 101 



39. Production of Wheat in the World 105 



xv 



