8 
percentage results it would be necessary to duplicate the 
experiments to an extent impracticable under the circum- 
tances governing work in the laboratory where 225 students 
are conducting two or three experiments each 
EXPERIMENT 5.—To demonstrate that dry wheat may be 
stored for some time in an atmosphere of nitrogen gas without 
impairing the vitality of the seed. 
were placed in three bottles—A, B, and C, respectively. In 
each bottle were placed two small tu e containing lime- 
water and the other an aqueous solution of pyrogallic acid 
The bottles were then carefull ime-water 
clear 
Test (1).—The grain from bottle A grew well w = 
planted on damp soil under glass. Immersion in practically 
pure nitrogen for fourteen days did not seem to produce any 
bad effects. : 
Test (2).—At the end of twenty-eight days the grain from 
bottle B was planted on damp soil under glass. It germ- 
inated freely. k 
T — i ttle was broken 
est (3).—Through an accident the bo vet Mies 
experiment demonstrated that dry wheat enclosed. in an 
a period of 104 days, but will not survive an immersion !n 
nitrogen for more than 143 days. 
_ EXPERIMENT 6.— To demonstrate the behaviour of wet 
grain stored in an air-tight receptacle. : 7 
Method.—A small quantity of wheat harvested in 191 
was soaked in water for about twelve hours. It was then 
drained of free water, and sealed in a bottle having a few 
layers of wet blotting-paper at the bottom. : 
Result.—The grain germinated and grew freely until vas 
plumule became about five-eighths of an inch long and un 
cle carrying root-hairs had grown to a length of no 
quarters of an inch. At this stage of growth further develop- 
ment ceased. No chlorophyll] was developed in the plama 
Mihe they were exposed to light. The plants quickly 
CO. EXPERIMENT 7 -—To demonstrate the visible effects " 
~a 9n wet wheat enclosed in an air-tight receptacle. 
