28 



THE TONER LECTURES. 



respiration, and as there were no disturbing struggles, the 

 universal paralysis being complete, must have been solely due 

 to the action of the carbonic acid upon the heart and the vaso- 

 motor centre. 



The evidence that the section was practised above the vaso- 

 motor centres, derived from the experiments themselves, is 

 therefore conclusive, but it is well to call attention to the fact 

 that it is already established that the vaso-motor centres are 

 in the medulla oblongata, a fact which strangely enough has 

 been overlooked by most, if not all, recent English writers, 

 finding, for instance, no expression in the very elaborate and 

 recent work of Dr. Flint.* A review of the evidence at this 

 place would interrupt the thread or line of the present argu- 

 ment, and I shall therefore defer it for a few minutes. 



In the following experiment the changes in the temperature 

 which followed separation of the medulla from the pons, are 

 apparently different from those previously obtained, but before 

 discussing the point, let me offer you the record of the expe- 

 riment itself. 



Experiment 8. 

 A stout j-oung dog above medium size. 



Remarks. 



Brain freed with slight hemorrhage. 



Medulla cut. Absolute paralysis of motion and of 

 sensation at once developed. 



* Since I received the proof of this lecture a number of the Boston 

 Medical and Surgical Journal has come to hand containing an article 

 from Prof. Bowditch on the work done abroad concerning the vaso- 

 moter centres. 



