SPECIFIC GRAVITY OF RICE SEEDS. 



Erom the above table, it can clearly be seen that the specific 

 gravity of rice seed increases with ripening. On the other hand, 

 the specific gravity is less when air dried than in the fresh state. 



These changes are probably to be attributed mainly to the fact 

 that the light and porous husk which is first formed does not change 

 in size with the development of the seed inside, and is moreover 

 relatively heavier in the milky and green stages than when fully 

 ripe, and that with drying the seed shrinks up by losing much water, 

 leaving much space between the seed and the husk, the space 

 necessarily being larger in the milky and green stages than when 

 fully ripe. 



The following table shows these relations clearly : — 



Stage of ripening. 



Weight of seed. 

 ( 20 grains) 



Weight o{ husk. 



Husks in ^ of 

 total weight 

 of seed. 



Milky 





265.8 mgr. 



8S.8 mgr. 



3341 % 



Green 





452.0 



92.6 



20.57 



Yellow 





582.4 



96.6 



16.60 



Full 





503- 1 



101.5 



16.83 



