1887.] Cerebral Cortex. Radiant Matter Spectroscopy. Ill 



February 17, 1887. 



Professor STOKES, D.C.L., President, in the Chair. 



The Presents received were laid on the table, and thanks ordered 

 for them. 



The following Papers were read : — 



I. "A Record of Experiments upon the Functions of the 

 Cerebral Cortex." By Victor Horsley, M.B., F.R.C.S., 

 F.R.S., Professor Superintendent of the Brown Institution, 

 and Edward Albert Schafer, F.R.S., Jodrell Professor of 

 Physiology in University College, London. (From the 

 Physiological Laboratory of University College.) Received 

 February 5, 1887. 



(Abstract.) 



The paper consists, as its title implies, of a record of experiments 

 relating to the functions of the cerebral cortex, a subject upon which 

 the authors have been engaged during three years. The experiments 

 have been entirely made upon monkeys. After describing the methods 

 employed, the general results of excitation and of extirpation of 

 various parts of the cerebral hemispheres on one or both sides are 

 given, and the cases in which the method of ablation has been 

 employed are then recorded in detail, the symptoms observed during 

 life and the condition of the brain after death being systematically 

 noted. Each case is illustrated by one or more drawings, showing 

 the exact condition of the brain post mortem. In some instances 

 sections of the brain are also represented. The paper includes also a 

 topographical plan of the excitable or motor region of the cortex 

 cerebri. 



II. " On Radiant Matter Spectroscopy : — Examination of the 

 Residual Glow." By William Crookes, F.R.S., V.P.C.S. 

 Received February 10, 1887. 



The duration of phosphorescence after cessation of the exciting 

 cause is known to vary w&hin wide limits of time, from several hours 

 in the case of the phosphorescent sulphides to a minute fraction of a 



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