22 



Kentucky Experiment Station (54) that this may "be accounted 

 for by the fact that the florets at the center of the spike 

 are pollinated first. 



Since it is so that there ia such a variation in weight 

 batr/een kernels of the same spike there are a number of men 

 who consider that it is not to "be expected that all large seed 

 should suppass smaller seed because the small seed may possess 

 the same inheritance as the large. It would seem, then, that 

 on account of this fact the smaller seed in a selection fl>r 

 size and weight would contain a larger proportion of the im- 

 mature and poorly developed seed the first time than it would 

 the second after the weaker plants resulting from such poor 

 seed would have been eliminated. The second and succeeding 

 seasons selections was practiced from wheat grown from seed 

 so selected the small size would contain a larger proportion 

 of seeds which are naturally small and this is pointed out by 

 Lyon (55) with the observation that several of the experiments 

 cited exactly fulfil these conditions. 



Mechanical Aids to Selection 

 of Seed. 



It is obvious that some of the finer methods of de- 

 termining the weights of seed are utterly impractical for 

 use on the farm. Thus far there seems to be but one method 

 of selecting for weight which is at all practical for the 

 average man and at the same time is generally understodd. 

 This is the air blast applied in some form. 



There are various devices making use of centrifugal 

 force or of the ability of seed to bounce from taught wires 

 but at the present time the most help would seem to lie 



