432 



T. YOKOI. 



r.ARLEY ; SORT, IIOZOROI. 



Weight of ;\ 

 grain, mgr. 



Weight of 30 

 grains, mgr. 



S]i. gr. 



TXT .^1, 1. _C 1 ,,1. 



Weiglu 01 husk, 

 mgr. 



Per cent of husk. 



Over 45 



'457-0 



1.2856 



130.5 



8.92 



40—45 



1289.4 



1.2658 



134.7 



10.45 



35-45 



1 140.8 



1.2762 



123.6 



10.83 



30—35 



1018.2 



1.2520 



122.7 



12.05 



Below 30 



781.6 



1-2375 



115.6 



>4.79 



From these tables it is obvious that tlie percentage of husk 

 has more or less influence upon the specific gravity of rice and 

 barley. 



In the case of wheat and naked barley, it is natural from the 

 reason above given that specific gravity and absolute weight can 

 have scarcely any or no relation with each other. Moreover these 

 seeds contain air cavities formed by the folding of the testa and the 

 size of these must have a great influence upon the specific gravity 

 of the seed, but tlie size of the air cavities undoubtedly can have no 

 relation with the size and weight of the grain. 



Notwithstanding these facts, Ando's experiments tend to show 

 that even with these grains some relation does exist between 

 specific gravity and weight, and that the specific gravity can be 

 used safely as a means of selection. He separated seeds of naked 

 barley besides rice and barley according to their specific gravities 

 with a solution of sodium bromide and sodium chloride and weighed 

 a certain number of grains air-dried. The results, as given in the 

 following table show that the average weight of the seed increases 

 with its specific gravity. 



