]0 March, 1916.] Rt-searches on Wheat Selection. 



145 



These figures show that the median grains, together with, the light 

 grains at either extremity of the head, have a lower percentage ot 

 germination and give a much lower average yield than tlie grains ot 

 tire remainder of the head. 



10 



20 



30 



40 



50 MILLIGRAMS 

 6&APtX OF EAR 



64 







^ 

 Q 



Q, 



BASLOF LAR 



10 20 30 40 50 



WEIGHTS OF GRAINS IN MILLIGRAMS 



Fig. i. — Weights of individual grains in a large ear of College Eclipse Wheat. 



Hence ]>rinie seed, coming from a centrifugal barrel grader (whicli 

 separates grain into grades according to tlie weight and size), should 

 be expected to give increased returns over ungraded seed. The grading 

 eliminates the majority of the non-jirolific median grains and the under- 

 sized, unproductive grains from the extre iiities of the ear. 



