JACQUES LOEB 



697 



Fig. 9. 



Figs. 8 and 9. Whole stems with leaf at apex on upper side. Stems in Fig. 8 

 with leaves reduced in mass produce fewer roots than stems in Fig. 9 with whole 

 leaves. In both cases roots are formed on the under but not on the upper side 

 of stems, except at the extreme cut end. The geotropic curvature is greater in 

 stems with whole leaves (Fig. 9) than in stems with reduced leaf (Fig. 8). Dura- 

 tion of experiment 36 days. 



