CONTENTS. 



CHAPTER XV. 



PAGE 



PUTREFACTIVE MILDEW OF TURNIPS AND CABBAGES. 



Peronospora parasitica, Pers. . . . .80 



CHAPTER XVI. 



WHITE-RUST DISEASE OF CABBAGES, ETC.Cystopuscan- 



didus, Lev. . 86 



CHAPTER XVII. 



CLUB- ROOT OF TURNIPS, CABBAGES, MANGELS, AND 



ALLIED PLANTS. Plasmodiophora Brassicce, Wor. . 94 



CHAPTER XVIII. 



EAR- COCKLE, PURPLES OR PEPPERCORN IN WHEAT, 



OATS, AND RYE. Tylenchus tritici, Bast. . .105 



CHAPTER XIX. 



CLOVER DODDER. Cuscuta Trifolii, Bab. . . . 115 



CHAPTER XX. 

 GRASS MILDEW. Erysiphe graminis, D.C. . . .126 



CHAPTER XXI. 



CORN MILDEW SPRING RUST AND MILDEW. Puccinia 



RuUgo-vera, D.C 135 



