338 



BACTERIAL DISEASES OF PLANTS 



Fig. 260. — Tyrosin crystals from an okl 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. 



