Chap. III. 



FUMARIACE.E. 



123 



greatly curved in under 4 hrs. When the loop was 

 removed, the petioles straightened themselves in about 

 the same time. The petiole (e) was rather less sensitive ; 

 and in another specimen, in which the corresponding 



Fig. 8. 

 Oorydalis claviculata. 

 Leaf-tendril, of natural size. 



petiole bore rather larger leaflets, a loop of thread 

 weighing one-eighth of a grain did not cause curvature 

 until 18 hrs. had elapsed. Loops of thread weighing 

 one-fourth of a grain, left suspended on the lower 



