52 



Buchanan 



The extra cord delay in the case of the crossed-reflex response may, as 

 will have been noticed, vary a good deal in preparations in which the 

 cord delay .in the case of the same-side reflex response is keeping fairly 



Fig. 9. — Electrical responses of the gastrocnemius 

 of a frog which had been injected ^ hour 

 before being prepared with 2 minims 01 

 ])er cent, liquor strychniae (Exj). 47). 



A, third response obtained when the intact sciatic nerve 

 of tlie same side was excited. [Time lines 820 per 

 second.] (A time mariner giving 400 d. v. per second 

 was being used this day, and its record is shown at 

 the top of the pliotograph.) B, fifth response when 

 the sciatic nerve of the opposite side was excited. 

 [Time lines 820 per second.] 



constant. This is especially well illustrated by Exps. 47 and 49. On the 

 other hand, the extra cord delay may remain very fairly constant in pre- 

 parations in which the same-side reflex delay is getting either longer [Exp. 

 40] or shorter [Exps. 16, 42, and 52]. 



I 



Fig. 10. — Electrical responses of the gastrocnemius of a small frog 

 which had been injected 2J hours before being prepared with 

 2 minims 0'02 per cent, liquor strychniae, and which has 

 been in the attitude characteristic of strychnine poisoning for 

 half an hour (Exp. 52). 



A, third response obtained when the intact sciatic nerve of the same side 

 was excited. [Time lines 830 per second.] B, third response obtained 

 when the sciatic nerve of the opposite side was excited. [Time lines 

 830 per second.] 



The extra delay does not vary with the strength of the effect 

 produced in the muscle, i.e. with that which represents the strength 

 of the physiological stimulus coming from the cord. Thus, both in Exp. 



