JACQUES LOEB 



379 



As a control the same experiments were made with leaves sus- 

 pended under water which had formed roots and shoots on both 

 their upper and their under sides though there were fewer on the 

 upper side. In this case there was no constant difference between 



TABLE II. 



Controls, Dry Weight of Upper and Lower Halves of Leaves Suspended Vertically 

 and Sidewise in Water. Roots and Shoots on Upper and Lower Sides. 



TABLE ni. 



Dry Weight of Upper and Lower Halves of Leaves Suspended Vertically and Sidewise 

 in Moist Air, Which Formed Some Shoots on Both Upper and Lower Sides. 



the dry weights of the upper and lower halves. The differences 

 found were very slight and occurred in both directions (Table II). 

 The same was true for leaves raised in moist air, which formed some 

 shoots on the upper side. The dry weights of the mass of the upper 

 and lower halves did not differ (Table III) . 



