PLATE 62 
1, 2.—Intumescences formed on a cauliflower leaf exposed 30 minutes in 10 1/2 
cubic feet of air space to vapor liberated from one-half gm. of secondary methylamin 
chlorid by adding 10 c. c. of a 15 per cent solution of sodium hydrate. Tempera¬ 
ture, i8°C. Time, 2 p. m. Collected nine days after exposure. 
1. —Under surface of leaf corresponding to figure 2. 
2. —Upper surface of same leaf. Many of these intumescences involved the whole 
thickness of the leaf; others appeared only on the under side, or only on the upper 
side. In figure 1 the unruptured swellings at X, X, correspond to ruptured tumors 
on the other surface of the leaf. X 3 1/2 nearly. 
Inasmuch as it is probably more or less difficult for the chemist to obtain an amin 
chlorid entirely free from ammonium chlorid it is possible that we have here to deal with 
mixed stimuli. This can not be stated positively until further experiments are made. 
My reason for thinking so is that in addition to the fishy odor of the dimethylamin, 
the odor of ammonia was also detected, especially when the nose was brought close 
to the capsule containing the mixture. 
