Fig. 1. Stems split longitudinally and suspended horizontally, each half stem 

 having one leaf at the apex; stem on left, whole leaf; stem on right, leaf reduced 

 in size. Considerably more roots are produced in the half stems with whole leaf 

 on left than on right where the mass of leaf is diminished. Geotropic curvature 

 is also greater where the mass of leaf is greater. Duration of experiment 36 

 davs. 



Fig. 2. Repetition of experiment in Fig. 1. 



689 



Duration of experiment 25 days. 



