64 EXPERIMENTAL PLANT PHYSIOLOGY 



again photographed on June 20th (Figs. 30 (a) 

 and 30 (b)). 



After this the petioles of the leaves began to droop. 

 This was especially the case in plant a, where, by the 



Fig. 30 (a) 



Fig. 30 (5) 



end of the month, the leaf petioles were hanging 

 vertically and the leaves were curled up. 



The plant b did not suffer so much. The new shoots, 

 developed from the dormant buds below the ring, 



