1914] 



CROCKER &• DA VIS— DEL A YED GERM IN A TION 



2 93 



embryos 



experiment ai 

 ad experiment 



falling 



experiment 



20a 



180 



increase in wt 



HOURS 



Fig. 2. — Rate of water absorption (percentage of increase over air-dry weight) 



by Alls ma seeds with pericarp removed: temperature 20 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; i", 400 seeds, coats intact and soaked in distilled 

 water. 



more than 30 per cent of them did so within 50 hours. In 

 the second many of the embryos had broken the coats after 10 

 hours, and about half had broken the coats within 43 hours. The 

 difference in the promptness of the action of the acid in these two 



