lilt 



I I I I I I I I I I 1 I I I I I I I I I I I I I I I I I i I 



03- 



02- 



1 I I I I IT I I I I I I I l l I I i I l I I I I I l I I l l 



SEC. '01 -OZ -OS 



c 



1 i i i 



03- 



02- 



I I I I I I I I I I I I I I I I I I I I I 



SEC. 



Fig. 30. 



Curve of action current of the musculus sartorius excitated by two suc- 

 cessive stimuli (St. 1 and St. 2). The effect of the second stimulus 

 is the less and the latent period is the longer the more quickly the 

 first stimulus is followed by the second. (Keith Lucas.) 



