56 



Buchanan 



successive responses of the same spots of the right gastrocnemius, obtained 

 by the alternate stimulation of the right and the left sciatic in Exp. 56. 

 No one can fail to see (and it is not only in these four records that the 

 phenomenon is to be seen) that the undulations on the curves which 

 represent the crossed-reflex response have a character of their own, different 



Fig. 12. — Electrical responses of the gastrocnemius of a frog 

 which had been injected with 2^ minims 0*02 per cent, 

 liquor strychniae two days before, and which had been in 

 the attitude characteristic of strychnine poisoning for some 

 time, but in which the limbs were no longer more than 

 somewhat stiff (Exp. 56 R). 



A, C, and E, first, second, and seventh responses respectively obtained 

 when the intact sciatic nerve of the same side was excited. [Time 

 lines 835, 830, and 827 per second respectively.] B and D, first and 

 second responses obtained respectively when the sciatic nerve 

 of the opposite side was excited. [Time lines 830 per second in 

 both cases.] 



from that of those on the curves representing the same-limb reflex response. 

 I have elsewhere shown (loc. cit.), and I have still better evidence than any 

 that has yet been published (namely, the records themselves) of the fact 

 that these undulations represent something for which the muscle alone is 

 responsible. The difference between the records, therefore, suggests that not 

 all the same muscle fibres, and consequently not all the same efferent nerve 



