370 



PLANT RESPONSE 



we may study the immediate and after-effects of rise of 

 temperature, and of the various chemical reagents. 



I iG. 157. Photograph of Shoshungraph 



\. plant-vessel; k, reservoir; c, compensator, whose balancing height is 

 adjusted 1>y rack and pinion, s ; k, key for manipulation of four-way 

 stop-cock; P, recording pen, (with counterpoise M, manipulated l>y 



wheel, \v. The drum is rotated by the clock at uniform speed. 



