i8 



ANIMAL ELECTRICITY. LECTURE 



the nerve itself, but only that of the combined 

 organ formed of the nerve, the nerve-terminal and the 

 muscle. It is equally clear that to follow the changes 

 taking place in the nerve, the galvanometer is prefer- 

 able to the muscle. And, finally, if once we are 



ill I n 



I n I 



I lllilii miiniiiiiim 



Fig. 7 (139). — Simultaneous record of the electrical response of nerve (upper 

 line), and of the mechanical response of muscle (lower line). 



Stimulation at 10 units throughout. Ordinary galvanometer. 



assured that the electrical indications are a true index 

 to the physiological state of nerve, regarded simply as 

 an excitable strand of protoplasm, it is evident that the 

 mathematical regularity of its electrical response to 

 regular electrical stimuli during long periods of time, 

 offers the best possible conditions and the best possible 

 object upon which to test the physiological modifica- 



