380 OLDENBUSCH: STIMULATION OF PLANTS 
TABLE I (con:) 
Serizs IJ. Germinated 3 days 
Exp. D. E. Average Avg. per day 
M/2,000 13.6 10.0 11.8 3.9 
M/4,000 13.3 13.8 13.6 4.5 
M/8,000 16.8 14.5 15.7 5.2 
M/16,000 14.7 T27 14.2 4.7 
M/22,000 14.9 14.2 14.6 4.9 
M/32,000 18.7 14.4 16.6 5.5 
M/40,000 12.7 15.3 14.0 4.7 
Control II.1 13.6 13.3 4.4 
Although these results show some irregularities due to the 
comparatively small number of cases, they also reveal a marked 
stimulation of growth especially in the solutions between 
M/22,000 and M/40,000 in CS, content. The stimulation in 
the three day experiments is proportionally greater than in the 
four day instances, showing that the stimulation tends to 
diminish, and growth tends to approach the normal after an 
interval, just as Townsend found. 
An experiment with Vicia Faba seedlings was carried out in 
the following manner. Theseeds were planted and allowed to 
germinate until the hypocotyls reached a convenient length to 
measure. A number 400 cc. bottles were almost filled with 
Knop’s nutrient solution and enough CS, solution was added to 
make of desired concentration. Thebottles were then fitted with 
corks, each cork having three holes bored in it, which were just 
small enough to prevent the seeds from falling through. The 
seedlings grown as above, were then washed in distilled water, 
hypocotylsm easured, and arranged in culture bottles so that 
seed rested on top of cork and hypocotyl extended through the 
hole into the solution. The bottles were placed in a dark 
chamber in the green house (temperature varying from 18° to 
25° C.), the hypocotyls were measured every twenty-four hours 
and the daily growth computed. 
