1914] 



CROCKER &• DA VIS— DEL A YED GERMINA TIOX 



295 



water absorption is increased by about 50 per cent. From these 

 facts, together with the structure of the seed, as well as from facts 



m 



180 



160 



increase in wt 



1 



I40J 



120 



•I 



X 



/» 



I 



HOURS 



21 



33 



43 



Fig. 3. — Rate of water absorption (percentage of increase over air-dry weight) 

 by Alisma seeds with pericarp removed: temperature 25° C; i, 400 seeds, coats 

 broken and seeds soaked in water; i\ 400 seeds, coats intact, first two hours in 

 o . 2 N HC1 and rest of the time in water; *" 400 seeds, coats intact and soaked in 

 distilled water. 



hindered from swelling before its imbibitional 



these 



sufficient to rupture 



initial rate of water intake by both the intact seeds and the seeds 



with 



