430 Mr. J. S. R. Russell. Circumstances under which [May 18, 



May 18, 1893. 



The LORD KELVIN, D.C.L., LL.D., President, in the Chair. 



A List of the Presents received was laid on the table, and thanks 

 ordered for them. 



The following Papers were read : — ■ 



I. " On Some Circumstances under which the Normal State of 



the Knee Jerk is altered."* By J. S. Risien Russell, 

 M.B., M.R.C.P., Assistant Physician to the Metropolitan 

 Hospital. Communicated by Professor Victor Horsley, 

 F.R.S. Received March 3, 1893. 



(From the Pathological Laboratory of University College, London.) 

 CONTENTS. 



1. Introduction. 



2. History of Previous Experimental "Work. 



3. The General Plan of the Present Research. 



4. Operative Procedure. 



5. The Effects of Asphyxia. 



6. The Effects of the Inhalation of certain G-ases. 



7. The Action of Ether and of Chloroform. 



8. The Effects of Anaemia of the Spinal Centres. 



9. The Action of Intravenous Injections of Absinthe and of Strychnia. 

 10. The Results of Section of the Spinal Cord. 



II. The Effect of Removal of a Cerebral Hemisphere. 



12. The Immediate and Late Effects of Extirpation of portions of the Cerebellum. 



13. On Extirpation of the Labyrinth (control). 



14. On Intracranial Section of the 8th Nerve (control). 



15. On Chemical Irritation of the 8th Nerve (control). 



16. Summary and Conclusions. 



Introduction. 



For the inception of the following work, which it is hoped will add 

 some further facts to our knowledge of the most important of the 

 " deep reflexes," the knee jerk, I am greatly indebted to the very 

 kind suggestions of Dr. Hughlings- Jackson. To him I owe my best 

 thanks for proposing the question of the influence of the asphyxia! 



* Part of the expenses connected with this experimental investigation have been 

 defrayed by a grant from the Scientific Grants Committee of the British Medical 

 Association. 



