1890.J Changes in Muscle during " Latent Stimulation" 17 



Diagram showing the time-relations of the electrical response (relative negativity 

 succeeded by relative positivity of the longitudinal surface of the gastrocnemius, 

 excited indirectly), and of the mechanical response (beginning of contraction of the 

 same muscle excited directly). 



The horizontal distance of the closer vertical lines from each other corresponds to 

 ^u- of a second. The photographic curves were copied twice their natural size by 

 " projecting " them on a sheet of paper. 



stimulation. It can scarcely be imagined that the electrical change 

 is later than the mechanical. 



The statement above as to the interpretation of the photographic 

 record of the electrical response is founded on the following experi- 

 mental facts. When a current of very short duration is led through 

 the electrometer, of such strength as to produce a movement of the 

 mercurial column comparable with those observed in the experiments 

 above described, the photographic record shows first that the mercurial 

 column during the passage of the current executes a rapid movement 



VOL. XLVIII. C 



