THE ANGULAR LEAF-SPOT OF COTTON I CAUSE 



329 



destroyed the greater number (Turkestan organism; Arizona 

 organism). Contrast with No. VIII. 



In various ways this organism resembles Bacterium campestre, 

 Bacterium phaseoli and Bacterium citri but I did not succeed in 

 cross-inoculating it to cabbages, to beans or to oranges. Fur- 



FIG. 251. Part of an agar-poured plate of Bacterium malvacearum enlarged 

 to show fugitive mottling of the surface colo nies. From one of the leaf spots shown 

 in Fig. 240. Time, third clay. Temperature 23C. Plating of March 20, 1915. 

 X 14. 



ther comparisons should be made not only with Bacterium cam- 

 pestre, Bacterium citri, and Bacterium phaseoli, but also with 

 Bacterium pruni, Bacterium juglandis, and Bacterium translucens, 

 all of which are closely related. Indeed, some of these names are 

 perhaps synonyms, but this can be settled only by many cross- 

 inoculations and much further study. 



