222 Drs. D. Ferrier and G. F. Yeo. [Jan. 24, 



January 24, 1884. 



THE PRESIDENT in the Chair. 



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

 them. 



The following Papers were read : — 



I. " Observations on the Influence of certain Culture Fluids 

 and Medicinal Reagents in the Growth and Development 

 of the Bacillus tuberculosis" By C. THEODORE WILLIAMS, 

 M.A., M.D., F.R.C.P., Physician "to the Hospital for Con- 

 sumption, Brompton. Communicated by Sir JOSEPH 

 Father, K.G.S.L, F.R.S. Received December 28, 1883. 



[Publication deferred.] 



II. " The Effects of Lesions of Different Regions of the Cerebral 

 Hemispheres." By David Ferrier, M.D., LLD., F.R.S., 

 and Gerald F. Yeo, M.D., F.R.C.S. Received January 19, 

 1884. 



(Abstract.) 



This paper contains a detailed account of a series of observations on 

 the effects of localised lesions of the brain of monkeys, made partly by 

 Drs. Ferrier and Yeo, and partly by Dr. Ferrier alone. 



The operations were performed under anesthetics, and according to 

 the rules and methods of antiseptic surgery. 



The experiments are illustrated by photographs, showing the posi- 

 tion and extent of the lesions and general condition of the brains, 

 together with sun-prints and microphotographs of sections of the 

 brain and spinal cord, showing the structures primarily involved or 

 secondarily degenerated. 



As the paper is mainly an anatomical description of the lesions 

 delineated and record of the effects produced, it scarcely admits of 

 condensation in the form of an abstract. The lesions are classified, 

 according to their position in the occipito- angular, temporal, Rolandic. 

 frontal, and hippocampal regions respectively. 



