vi 



Page 



On the Differential Covariants of Plane Curves, and the Operators em- 

 ployed in their Development. By R. F. Gwyther, M.A., Fielden 

 Lecturer in Mathematics, Owens College, Manchester 420 



List of Presents 427 



May 18, 1893. 



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 430 



An Experimental Investigation of the Nerve Roots which enter into 

 the Formation of the Lumbo-sacral Plexus of Macacus rhesus. By 

 J. S. Risien Russell, M.B., M.R.C.P., Assistant Physician to the 

 Metropolitan Hospital 459 



A Further Minute Analysis by Electric Stimulation of the so-called 

 Motor Region (Facial Area) of the Cortex Cerebri in the Monkey 

 (Macacus sinicus). By Charles E. Beevor, M.D., M.R.C.P., and 

 Victor Horsley, M.B., F.R.C.S., F.R.S 463 



On the Influence exercised by the Central Nervous System on the 

 Cardiac Rhythm, with an Inquiry into the Action of Chloroform on 

 that Rhythm. . By John A. Mac William, M.D., Professor of the 

 Institutes of Medicine in the University of Aberdeen 464 



On the presence of Urea in the Blood of Birds, and its bearing upon 

 the Formation of Uric Acid, in the Animal Body. By Sir Alfred 

 Garrod, M.D., F.R.S 478 



List of Presents 485 



Obituary Notice :— 

 James Thomson 



Index. 



