16 



cultural College: (30) 



Ho. kernels Ho. kernels per cent 

 Grade tested germinated germination 



Heavier than the average 4,707 4,684 98.74 



Lighter 2.972 2.877 96.80 



Total 7.679 7,561 97.99 



Separation into five sizes by sieves showed; There is 

 a slight "but not constant difference "between the germination 

 of kernels separated "by sieves. (2) The largest kernels do 

 not always germinate the "best. (3) The smallest kernels 

 usually but not always germinate the poorest. 



Separation according to density by means of a wind 

 blast gave the following results; 



Grade Average % 



germination 



1 99.19 



2 98.00 

 8 95.16 



4 87.63 



5 71.70 



6 53.95 



The Effect of the Specific Gravity 

 Upon the Yield. 



A 



Pommel and Stewart at the Iowa Experiment Station (31) 

 report that of thirty-seven samples examined the average 

 specific gravity of the seed of wheat was 1.469, the amount 

 varying between 1.503 and 1.407. Their method was to first 

 weigh the seed in air and again while immersed in Kerosene 

 oil. That this does not represent the range of the specific 

 gravities of the wheat kernel is readily seen from the suc- 

 ceeding reference. 



"Seed wheat of four varieties was separated by Church (32) 

 by means of solutions of calcium chloride having specific 



gravities of 1.247, 1.293, and 1.31. The seed was first 



