A. B. 



FIG. 36. 



To show that seeds need water for germination. The beans 

 in bottle A were soaked 2 hours, those in bottle B were soaked 

 24 hours. They were then removed from the water and put 

 into dry bottles. 



B. L. 



FIG 37. 



To show that seeds need air for germination. The beans in 

 both bottles were soaked 24 hours, and then were put into dry 

 bottles. Bottle A contained sufficient air to start the few 

 seeds. Bottle B had not enough. The water in the tumbler 

 C did not contain sufficient air for germination. See experi- 

 ment, page 72. 



