EXCITATORY CHARACTER OF SUCTIONAL RESPONSE 369 



Balance is employed, which depends upon an application of 

 compensation, by which, under normal conditions, the water- 

 index is kept stationary, though the suctional movement in 



FIG. 218. 



The Shoshun graph 

 plant-vessel ; R, reservoir ; c, compensator, whose balancing height is 

 adjusted by rack and pinion, s; K, key fqr manipulation of four-way 

 stop-cock ; p, recording pen, with counterpoise M, manipulated by 

 wheel, w. The drum | is rotated by the clock at uniform speed. 



