126 



Elementary Plant Physiology. 



Fig. gg. — Tendril of squash a few seconds after 

 contact with a wooden rod. A slight curvature 

 has been formed. 



as an air current, 

 a shower of water 

 drops, and the 

 fumes of ammonia 

 or chloroform (Fig. 



97)- 



Mimosa affords an 

 excellent example of 

 the daily movements 

 shown by so many 

 plants. 



138. Move- 

 ments of stamens, 

 etc., in response 



to shock Secure 



flowering specimens 

 of Berberis, Opuntia, 

 Cereus, Portulaca, or 

 purslane, and make 

 various tests of the 

 irritability of the 

 stamens by touching 



Fig. 100. — Tendrils of bryony after grasping a support. After Kerner. 



