LIST OF IIvLUST RATIONS. 



VII 



Page. 



Fig. 64. Wound Reaction (third day)in Pricked 



Potato-leaf, plant No. 61 239 



65 . Leaf of Cucumber Plant No. 9 1 , show- 



ing Pricked and Wilted Area (the 

 shaded part) 242 



66. Progress of Wilt in 8 days on Inocu- 



lated Leaf of plant No. 113 247 



67. Cross-section of Inoculated Plant No. 



149 at extreme top of stem, showing 

 Infection of all the bundles 250 



68. Lamina of Squash-leaf (in section), 



showing the Bacteria confined to 

 the bundle although Wilt involved 

 the Parenchyma 251 



69. Infected Bundle of Inoculated Musk- 



melon No. 150 252 



70. Sketch of Swollen Bacteria from the 



Interior of Vine No. 199 256 



71. Wilt of Inoculated Winter Squash at 



end of 9 days, plant No. 215 258 



72. Progress of Wilt in Inoculated Squash 



leaf on plant No. 216 259 



• 73. Inoculated Squash-leaf on plant No. 



223 261 



74. Progress of Wilt on Leaf of Inoculated 



Plant No. 245 265 



75. Wilt on Leaves of Cucumis melo, var. 



dudaim, plants 276, 277 269 



76. Wilt on Inoculated Leaf of Cucurhita 



calif ornica, plant No. 280 269 



77. Cross-section of Petiole of Inoculated 



Leaf of Cucurbita foetidissima 

 (Plant 273), showing Bacteria con- 

 fined to the Vascular Bundles 272 



7 8 . Detail from Vascular Bundle of Cucur- 

 bita foetidissima occupied by B. 

 tracheiphilus. . . ■ 273 



79. Single Spiral Vessel of Cucumber Stem 



in cross-section, showing Lumen 

 plugged by B. tracheiphilus 285 



80. Cross-section of Petiole of an Inocu- 



lated Squash-leaf — 12 bundles oc- 

 cupied by B. tracheiphilus 286 



81. Cross-section of a Squash Bundle 



destroyed by B. tracheiphilus. It 

 also shows occupation of surround- 

 ing parenchyma 287 



82. Camera drawing of unstained B. 



tracheiphilus from stem of a Wilted 

 Cucumber from the field (i 893) 288 



83. Sketches of dividing rods of B. 



tracheiphilus after staining with 

 nitrate of silver 288 



84. Flagellate rods of B. tracheiphilus, 



capsule also stained 288 



85. Gelatin-stab cultures of B. trachei- 



philus 288 



86. Gelatin-streak culture of B. trach- 



eiphilus 290 



87. Petri Dish Agar Poured-plate of B. 



tracheiphilus at end of 6 days 291 



Fig. 88. 

 89. 

 91. 

 92. 



93- 

 94- 



95- 

 96 



97. 

 98. 



99. 



103. 



104. 



105. 

 106. 

 107. 

 108. 



109. 



no. 

 III. 



113. 



Page. 



Small portion of Agar Poured-plate at 

 end of 7 days in thermostat 291 



90. Enlarged Colonies of B. trachei- 

 philus 291 



Streak Cultures of B. tracheiphilus, 

 showing discrete growth 292 



Behavior of B. tracheiphilus in Fermen- 

 tation-tubes 293 



Simple apparatus used for Testing 

 Growth in Hydrogen 294 



Restricted growth of B. tracheiphilus 

 on a Slant Agar Streak buried under 

 more agar 295 



Restricted growth of B. tracheiphilus 

 in Acetic Acid Agar 295 



Crystals in old Litmus-milk Cul- 

 tures of B. tracheiphilus 296 



Germicidal Action of Sunlight on B. 

 tracheiphilus 297 



Cabbage-leaf showing upward move- 

 ment of Brown Venation due to 

 Bad. campestre 301 



Dwarfing and Loss of Leaves in 

 Cauliflower attacked by Bad. cam- 

 pestre 302 



Head of Cabbage showing Blackened 

 Vascular Ring due to Bact. cam- 

 pestre 303 



Cauliflower Stem from Texas, show- 

 ing Blackened Vascular Ring due 

 to Bad. campestre 303 



Cross-section of Petiole of Cabbage, 

 all the bundles of which are black- 

 ened hyBad. campestre 304 



Cauliflower Stems from Florida, show- 

 ing disease further advanced, i. e., 

 cavities in the pith 305 



Cross-sections of Kohlrabi showing 

 Blackened Vascular Bundles in 

 White Flesh 306 



Stem of Collards attacked by Bact. 

 campestre 307 



Turnip-root hollowed out by Bact. 

 campestre 308 



Cavity in fleshy part of Kohlrabi due 

 to Bad. campestre 309 



Cabbage-leaf showing wedge-shaped 

 area of Bacterial Infection (Black 

 Venation) attributed to insect 

 Gnawings 310 



Cross-section of Cauliflower Petiole 

 showing tissues occupied by Bact. 

 campestre 311 



A detail from fig. 109 312 



Cross-section of Turnip-root showing 

 two vessels, one fully occupied by 

 Bact. campestre 313 



Longitudinal section of Turnip-root 

 showing bacteria in a vessel 314 



114. Bacterium campestre occupying 

 Intercellular Spaces 315.316 



