27 



The apparatus shown in ?ig. 9. is interesting on account of 

 the adjustability of the meshes tut the danger of "bending the 

 wires out of shape would seem to lessen its probable durability. 



* 



A criticism applying to the three last machines is that they 

 make use only of size in selecting seed and do not select on 

 the basis of weight as well. If Wollny (39) is right in 

 saying that the advantage of large seed lies in absolute weight 

 rather than in density, the very way to secure this absolute high 

 weight is by combining selection for size with selection for 

 density. 



