LIST OF ILLUSTRATIONS. 



WHITE RUST DISEASE OF CABBAGES. 



FIG. PAGE 



32. Cystopus candidus, Lev. , x 400 ; with conidium and 



zoospores x 1000 88 



33. Reproductive organs and oospores of Cystopus can- 



didus, Lev. 91 



CLUB-BOOT OF TURNIPS, CABBAGES, MANGELS, AND 

 ALLIED PLANTS. 



34. Clubbed-root of young turnip, one-half the natural 



size 97 



35. Section through a small club, x 10 . . . . 98 



36. Section through fragment of turnip-root, showing the 



plasma of Plasmodiophora Srassicce, Wor. , x 200 . 98 



37. Section through fragment of turnip -root showing 



spores of Plasmodiophora Srassicce, Wor., x 200 . 100 



38. Spores of Plasmodiophora Brassicce, Wor. ; and rest- 



' ing-spore of Peronospora parasitica, Pers., x 1000 101 



39. Germinating spores of Plasmodiophora Srassicce, 



Wor., xlOOO 101 



EAR-COCKLE, PURPLES OR PEPPERCORN IN WHEAT, 

 OATS, AND RYE. 



40. Spikelet of wheat, x2 106 



41. Horizontal section through spikelet of wheat, x 4 . 106 



42. Grain of wheat enclosed in its pale, x5 . . . 108 



43. Scale or lodicule of wheat grain, x 50 . . .108 



44. Spikelet of wheat, the grains replaced by the galls 



of Ear-Cockle, x2 109 



45. Galls of Ear- Cockle from a wheat spikelet, x 5 . 110 



46. Fragment of wall of gall of Ear-Cockle with Nema- 



toid worms, Tylenchus tritici, Bast., in situ, x 40 112 



CLOVER DODDER. 



47. Cuscuta Trifolii, Bab., growing on clover, x2 . 116 



48. Seeds of red clover, yellow trefoil, Dutch clover, and 



clover Dodder, x 5 117 



49. Seeds of perennial red clover and clover Dodder, seen 



in section, arid germinating, x 10 . . .118 



