Elcctromotirc PluTiomena of Non-meduUated Kerve. 383 



Fig. 1— March 23, 1899. Pike of 2^^ lbs. weight. Olfactory nerve I quite fresh. 

 Momentary mechanical stimulation by scissor-cut. Following upon the nega- 

 tive variation there is a very slight and slowly developed positive after-effect. 



Fig-, 2. — March 20. — Pike of 5^ lbs. The two olfactory nerves are used together, 

 quite fresh. Mechanical stimulation by cutting. The negative variation is 

 seen as two responses incompletely fused, obviously owing to the fact that the 

 stroke of the scissors affected the two nerves successively. 



Fig. 3. — March 18. Olfactory Nerve I. Stimulation by single break induction 

 shock coil O.C.M. The signal S shows the moment of stimulation. In all 

 three curves the time is marked in seconds. 



In a further series of observations the nerve was stimulated at 

 regular intervals by brief tetanising currents, the galvanometric deflec- 

 tions being sometimes photographically recorded (Waller's method*). 



* Croonian Lecture, ' Phil. Trans.,' B, 1897. 



