PHENOMENA OF MUSCLE AND NERVE. 



289 



The numbers denote the intervals in millimeters polarising current led in at 

 A-B, leading-off electrodes at cc" and dd'. 



The battery elements, as in all the following examples, were zinc and carbon, the 

 duration of closure, unless otherwise stated, being extremely short. As no special 

 care was taken to make the closure always of equal length this being effected by 

 the hand the inequality in the deflections of successive experiments may be taken 

 as due to this. Comparisons of the amounts of deflection can only therefore be made 

 in the case of observations taken at the same time in cc' and in dd'. This holds good 

 for all the following experiments. 



The comparison of the two deflections in cc' and dd' is naturally further compli- 

 cated through differences in the two galvanometers differences as well in the delicacy 

 as in the period of oscillation of the magnets. We have taken the necessary read- 

 ings for correcting the deflections so as to give them the value which they would have 

 had if the two instruments had been identical. But this reduction has no practical 

 importance, and is therefore omitted in the experiments given. The first glance 

 shows that the galvanometer in connection with cc' was the more delicate one. A 

 deflection off the scale is denoted thus oo. 



The letters A and C denote that the leading-off electrodes lay respectively in the 

 neighbourhood of the anode and kathode. 



Another example. Two sciatic nerves, as in the preceding experi- 

 ment. 



c c' d d' 



I 6 i I0 i 

 A ' 1 i-i 



35 



I 8 



IJLJ 



B 



