THE PHENOMENON OF CONTRACTION. 



31 



a similar result from the action of veratrin. Although the explana- 

 tion is not forthcoming, the fact that a single stimulus gives under 



these conditions two processes of contractions is interesting as an 

 exception to the general rule. It may be added that a curarized 

 frog's muscle, when heated to the point of optimum activity (28 C.) 



