THE PHENOMENON OF CONTRACTION. 



31 



action of glycerin. We have in such substances reagents that affect 

 one phase of the contraction process without materially influencing 



Kg- 



8.1 





the other. As regards the veratrin effect, it becomes less and less 

 marked if the muscle is made to give repeated contractions, but 

 reappears after a suitable period of rest. The peculiar action of 



