1915] HARVEY—ETHYLENE 199 
A. CHEMICAL ANALYSIS 
1. General procedure 
At the close of the culture period, the epicotyls of the seedlings 
were collected, their wet weight determined, and preserved in 
Fic. 2.—Sections of the sweet pea epicotyl at the stage corresponding to fig. 1: 
A and B, normal; C and D, ethylene treated; X50. 
85 per cent alcohol? (redistilled). Both the ethylene treated and 
the untreated samples usually weighed 100-150gm. Soon after 
2kn rs OR = 1 ba oe 1 tration Re ner 
5 per cent, 
h 
oS > ee al vr 
allowing for water in the tissue, which was about 92 per cent. 
