THE INFLUENCE OF GRAVITY 



77 



Fig. 56. — The same specimen as in Fig. 55 one day later. Rate of curvature 



increases with mass of leaf 



naaaaoL 



H^Hoa 



a 



Fig. 57. — The same specimens as in Figs. 55 and 56. Curvature in b now almost 



equal to that of a. May 14. 



