LIST OF ILLUSTRATIONS XX111 



PAGE 



243. Cross-section (under a stoma) of an angular leaf spot of cotton in an 



early stage of infection, i.e., before collapse and shrinking of the 

 spot. . 320 



244. Cotton leaf inoculated from a "windowed" colony of Bacterium mal- 



t'ficeartim. Time, 53 days 321 



245. Green cotton bolls accidentally attacked by Bacterium malvacearum. 



Hothouse. 1904. ... 322 



246. Middle stage of bacterial boll spot of cotton due to Bacterium mal- 



I'acearum lint involved a little 323 



247. Cotton stems attacked by Bacterium malvacearum "black arm" of 



cotton 324 



248. Flagellate rods of Bacterium malvacearum 325 



249. Agar-poured plates showing development of Bacterium malvacearum 



five days after exposure of one-half to bright sunlight for 2 minutes. 

 Contrast with figure 228 ... .... 326 



250. Effect of freezing on Bacterium malvacearum 328 



251. Young (3-day) agar-plate colonies from one of the spots shown in 



figure 240. Plating of March 20, enlarged 329 



252. Agar colonies of Bacterium malvacearum to show fugitive mottling. 



Plating of March 22. Photographed March 25 330 



25.3. Photograph of "windowed" colonies (Nos. 4 and 5 of March 24) as 



they appeared on March 26 when filled in. See figure 256 332 



254. Third day agar plate of Bacterium malvacearum showing "windowed" 



and feebly mottled surface colonies 332 



255. Accidental inoculations of Bacterium malvacearum on cotton bolls. 



Early stage. 1915 : . . 333 



256. Mottled colonies of Bacterium malvacearum on agar plate (for later 



appearance see figure 253). Also three buried colonies 334 



257. Spatulate, finger-like down-growths of Bacterium malvacearu'in in soft- 



ened gelatine 335 



258. Streak cultures of Bacterium malvacearum and Bacterium phaseoli on 



Loffler's solidified blood serum 336 



259. Milk culture of Bacterium, malvacearum 337 



260. Tyrosin crystals from old litmus milk culture of Bacterium malvacearum 338 



261. Section of diseased cotton leaf extruding bacteria through a stoma in the 



upper epidermis. From the field 338 



262. American mulberry shoot inoculated with Bacterium mori Boyer and 



Lambert emend. EFS. Leaves spotted and distorted 341 



263. Distortion of South African mulberry leaves due to Bacterium mori 342 



264. Inoculated shoots of mulberry showing sunken stripes and extrusion of 



bacteria in cirri from lenticels 343 



265. South African mulberry twigs killed by Bacterium mori 344 



266. French Morus nigra attacked by Bacterium mori 345 



267. French Morus alba attacked by Bacterium mori 346 



268. Cross-section of stem-tissues of mulberry showing inner bark destroyed 



by Bacterium mori as the result of a natural infection. Arkansas, 

 1908 347 



269. a, Same as figure 268 but enlarged; b, cavity in a stem resulting from 



an inoculation. . 349 



