Mixed Nerve and in the Anterior and Posterior Roots. 357 



III. (1) Experiments showing Electrical Changes at the Central End 

 of Posterior Roots alone. Excitation of Sciatic of same side. 



III. (2) Ditto, ditto. Excitation of Sciatic of opposite side. 



In these last nine experiments where the lead-off was from posterior 

 roots the deflection had not the characters of a reflex deflection 

 viz., delay and exhaustibility ; the negative variation followed at 

 once on stimulation and could be repeated without the pause necessary 

 in the case of an ordinary reflex. The same thing was also observed 

 on one occasion in the case of anterior roots (experiment of June 29). 

 In the remaining experiments III (3) where, the bulb being stimulated, 

 the posterior roots were led off to the galvanometer, this non-reflex 

 effect was observed in certainly two cases (June 29 and 30). 



