53 



tainiug a small portion of nitric acid, was applied to the specimens. 

 This solution colors starch blue, fiing-oid trtinsparent matter a light am- 

 ber, infusorial forms a dark amber, while cellulose and chlorophyl re- 

 main colorless nnder certain conditions. When viewed under a power 

 of 100 to 600 diameters these substances are clearly distinguished from 

 one another. I also submitted the dry leaves of the twigs to the same 

 processes and examined their translucent cellular forms carefully, and 

 observed some indications of fungus spores witliin the cells of the leaves. 

 1. Fig. 1 represents the general appearance of the bkick-knot of the 

 cherry; 2, a cross section; 3, an enlarged vievr of it, showing indeata- 



