THE CHEMISTRY OF MUSCLE. 71 



stimulus as expressed in the amount of current used, the summation 



Fig. 28. Imitation of incomplete tetanus by the artificial muscle. The time and 

 duration of the successive heatings are indicated by the breaks in the lower line. Each 

 such heating causes a separate contraction, and these contractions are summated as in the 

 tetanic contraction of muscle. 



of successive stimuli, etc. Under all of these conditions it imitates 

 closely the behavior of plain muscular tissue. 



