1938 



A TEXTBOOK OF THEORETICAL BOTANY 



I 



I 





-~< 







Fig. 1865. — Psychotrin bacteriophila. Abo\e, foliage showing 

 the bacterial colonies as dark spots on the leaves. Below, a 

 section through one of the colonies. The bacteria enter 

 what was originally a schizogenous secretory cavity, in 

 which they multiply and the cavity enlarges. 



