THE STORY OF NINETEENTH-CENTURY SCIENCE 



bearer. According to his experiments, first performed 

 upon the frog, the nervous "current" travels less than 

 one hundred feet per second. Other experiments per- 

 formed soon afterward by Helmholtz himself, and by 



EMIL DU BOIS RAYMOND 



various followers, chief among whom was Du Bois-Re\ T - 

 mond, modified somewhat the exact figures at first ob- 

 tained, but did not change the general bearings of the 

 early results. Thus the nervous impulse was shown to 

 be something far different, as regards speed of transit, 

 at any rate, from the electric current to which it had 



408 



