LIST OF ILLUSTRATIONS 



FIGURE FACING PAGE 



1. Effect of Fertilizers and Watering on the Yield 



of Lettuce 5 



2. Effect of a Balanced Fertilizer on Corn and 



Clover 9 



3. Conidiophore and Conidia of Pythium . . 19 



4. Nematode 25 



5. Leaf Blight Nematode 27 ' 



6. Steam Sterilization Apparatus 37 v 



7. Effect of Soil Sterilization 39 



8. Melcher's Soil Sterilizer 43 



9. Action of Different Light Rays on Coleus and 



on Lettuce 63 



10. Action of Different Light Rays on the Color of 



Plants 65 



11. Sling Psychrometer 77 



12. Effect of Subirrigation on Lettuce .... 85 



13. Effect of Etherization on Plants .... 87' 



14. Effect of Etherization on Hybiscus syriacus . 89 ' 



15. Bean Diseases 111/ 



16. Beet Diseases 115 



17. Cauliflower Disease . 123 



18. Celery Disease 131 



19. Celery Disease 133 



20. Young Healthy Greenhouse Cucumber Plants 135 



21. Cucumber Diseases . . 137 ^ 



22. Cucumber Root Knot 141 



23. Egg Plant Diseases 143 



24. Egg Plant Diseases 145 



xiii 



