
256 BOTANICAL GAZETTE [ APRIL 
experiments as recorded in table VI were undertaken. In these 
experiments the seeds were treated as in the experiments recorded 
in table III, except that at the end of seven days the seeds 
exposed to the gas from 0.010% of KCN or more per cubic foot 
were removed from the gas and placed in a gas free atmosphere. 

6 ¢ 
Fic. 5.—a, control; 4, seeds were in gas from .0308™ KCN per cubic foot for 168 
hours; c, Seeds were in gas from .o10o™ KCN per cubic foot for 168 days. — Photo- 
grablied at end of 18 days. See table VI. 
At the end of seven days, after placing the seeds in ordinary 
atmosphere, 50 per cent. of those that had been exposed to the 
gas from 0.010 of KCN germinated. In other words, the seeds 
that germinated had been held in a dormant condition for seven 
days in the gas and for seven days after removing from the gas, 
a total of fourteen days. Likewise seeds that had been in the 
gas from 0.050" of KCN per cubic foot were held in a dormant 
condition for twenty days. In the preceding case only five 


