140 



Mr. Graham Brown. 



[Nov. 12, 



I wish to thank Mr. G. Winfield for the trouble he has taken in making 

 himself familiar with the use of my spectroscopes. I am also most grateful 

 to Prof. Gotch for the kind suggestions he made to me early in the present 

 research as to the best line of attack ; these have been of the greatest 

 assistance. 



TJie Phenomenon of" Narcosis Progression " in Mammals.* 

 By T. Graham Brown (Carnegie Fellow). 



(Communicated by Prof. C. S. Sherrington, F.R.S. Received November 12, 1912, — ■ 



Read January 23, 1913.) 



(From the Physiological Laboratory of the University of Liverpool.) 



CONTENTS. 



PAGE 



I. Introduction ; 140 



II. Methods Employed 142 



III. Narcosis Progression in Guinea-pigs 142 



IV. Narcosis Progression in Cats : Intact Hind Limbs, Bilateral Progression ... 143 

 V. Narcosis Progression in Cats : Intact Hind Limbs, Unilateral Progression... 146 



VI. Narcosis Progression in Cats : The Effect of some Lesions of the Nervous 



System 148 



VII. Narcosis Progression in Cats : In Individual Muscles 150 



VIII. Narcosis Progression in Cats : The Effect of Asphyxia 161 



IX. Conclusions 158 



X. Summary 162 



I. Introduction. 



At present the subject of " reflex walking " is one almost entirely neglected 

 by physiologists, yet it is of fundamental importance in the physiology 

 of the nervous system. For this reason it is desired to lay stress upon 

 it by means of the present paper, which is to be regarded as a prelimi- 

 nary account of a phenomenon which will later be described in greater 

 detail. 



The present author has already described certain movements of progression 



* The expenses of this research have been defrayed by a grant from the Carnegie Trust. 

 The results here described were embodied in a thesis presented to the University of 

 Edinburgh on March 31, 1912. 



