Aug. 14, 1916 Agricultural Value of Impermeable Seeds 



773 



exceptions, very few of the impermeable seeds of the different kinds of 

 clover, except crimson clover, will produce seedlings in the soil even in 

 three months at temperatures such as prevail in late spring or in summer. 



O X 04 1) 



Fig. 3.— Curves showing the changes in the permeability of seeds in wet blotters and in dry storage for 



various periods. 



The case of alfalfa, crimson clover, and the larger-seeded species is 

 different. It was calculated that varying percentages of the impermeable 

 seeds of alfalfa, hairy vetch, Canada field pea, cowpea, and okra pro- 

 duced seedlings in a few days or weeks both in a moderately warm 



