338 



BACTERIAL DISEASES OF PLANTS 



FIG. 260. Tyrosin crystals from an old litmus-milk culture of Bacterium 

 malvacearum. Arizona cotton, culture of March 20, 1915. Compare with Fig. 93. 

 Photographed June 3. X 5. 



FIG. 261. Section through an early stage of an angular spot on a cotton leaf, 

 showing the bacteria (at X) extruding through a stoma in the upper epidermis. 

 Dillon, S. C., 1900. 



