44 



EXPERIMENTAL PHYSIOLOGY 



ergograph, the muscles of the fingers being fatigued by causing them to 

 repeatedly raise a heavy weight or repeatedly deflect a strong spring. 



PIG. 40. DIAGRAM OP BERNSTEIN'S EXPERIMENT TO ILLUSTRATE THE BLOCKING EFFECT OF A 

 CONSTANT CURRENT UPON CONDUCTION OF NERVE-IMPULSES. 



The extent of the contractions is recorded upon a very slowly 

 revolving drum, and a fatigue curve or ergogram which shows 





FIG. 41. DIAGRAM OF Mosso's ERGOGRAPH FOR THE INVESTIGATION OF FATIGUE 



IN THE HUMAN SUBJECT. 



individual peculiarities is thereby produced in the same manner 

 as with the frog muscle-nerve preparation (p. 42, (6)). 



