ON THE MAMMALIAN NERVOUS SYSTEM. 



493 



the opposite sciatic nerve, or corresponding posterior root of the opposite side, for 

 excitation. We made this experiment in nine Cats, two Monkeys, and one Rabbit. 



Fig. 21. 



The effect in the observed sciatic nerve was, consequently, that due to the discharge 

 of the nerve centres on the side opposite to that of stimulation, or on both sides 

 of the cord. 



Owing to the higher excitability of the posterior roots, as compared with that of 

 the mixed sciatic nerve, it is not surprising that we found considerable difference 

 in the amount of effect obtained by crossed reflex action, according as it was 



