GERMINATION OF THE GRAIN 



27 



" SWAN " WHEAT 

 Temperature 16 C. 



The relative volumes and weights of the grain when dry, and the same 

 after soaking 5 hours and 28 hours respectively, were found in one trial 

 to be: 



Air-dry. 



Relative volume 

 Relative weight 



After soaking. 



5 Hours. 28 Hours. 



1-416 



1-222 

 1-190 



The increase in volume is somewhat greater than the addition in 

 weight, an augmentation of the latter of 19 and 36 6 per cent respec- 

 tively being attended by a rise in volume of 22 2 and 41 -6 per cent. 



The optimum temperature at which germination is most rapid lies 

 between 20 and 22 C., the minimum, below which it is completely 

 checked, is about 4 C. The influence of different temperature is seen in 

 the following results obtained with a Squarehead form of wheat harvested 

 in August and tested in November 1914. 



