ransinission 



of Reflex Impulses in Spinal Coixl of the Frog 255 



In 3Iiss Buchanan's observ^ations the prominent effects of strychnine 

 on cord times were a slight diminution of time for the simple reflex 

 and a considerable diminution of the additional time for the crossed 

 reflex, e.g., 



Simple. Crossed. 



Normal . 

 Strychnine 



0-012 to 0-022 

 0-009 to 0-020 



0-010 

 004 



while I got considerable augmentation of the simple reflex time with little 

 or no alteration of the additional time, e.g., 



Simpl( 



0-010 

 0-030 



Crossed. 



0-010 

 0-010 



(1) Simple reflex contraction, 



(2) Crosse<l reflex contraction 



O-04tl 

 Difference, 0-OOs 



(1) Simple reflex contraction (leg), 0060 



(2) Transmitted reflex contraction (arm), 0"06S 



There is, of course, no actual incompatibility l)etween these two sets of 

 flgures taken in light and in deep strychninisatioii respectivel}-. It appears 

 to nie, however, that the latter as well as the former require to be taken 

 into account before we can accept Miss Buchanan's conclusion that in the 

 same-side reflex a single synapse has to be passed, while in the crossed-limb 

 reflex two such synapses have to be crossed in succession. Given the fact 

 that in deep strychnine intoxication the times of the uncrossed and cross 

 reflex movements are, e.g., 0-04 sec. and O'Oo sec, we have to assume on the 



