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XIX. A record of Experiments on the Effects of Lesion of Different Regions of the 
Cerebral Hemispheres. 
By David Ferrier, M.D., LL.D., F.R.S., Professor of Forensic Medicine in King’s 
College, and Gerald F. Yeo, M.D., F.R.C.S., Professor of Physiology in King’s 
College, London. 
Received January 19,—Read January 24, 1884. 
[Plates 20-36.] 
Prefatory Note. 
The facts recorded in this paper are partly the results of a research made conjointly 
by Drs. Ferrier and Yeo, aided by a grant from the British Medical Association, and 
partly of a research made by Dr. Ferrier alone, aided by a grant from the Royal 
Society. 
It has been considered convenient and advisable to publish the results together, 
more especially with the view of contrasting the different effects of lesions of different 
parts of the brain established under similar conditions. 
The conjoint experiments are distinguished by an asterisk. Of these alone joint 
authorship is to be understood. A preliminary account of some of these has already 
been given by the authors:—at the meeting of the British Medical Association at 
Cambridge in 1880, and at the International Medical Congress in London in 1881. 
The experiments are here related in detail. 
The number of illustrations which accompany the paper is large, but this is con¬ 
sidered necessary, as the text is mainly a short description and simple comment on 
the effects of the lesions delineated. 
The illustrations have for the most part been executed by Dr. Ferrier, and consist 
of photographs taken, with few exceptions, direct from the brains after hardening in 
spirit or bichromate solution, and of sun-prints [direct from the sections used as 
negatives], and microphotographs of sections made by him. 
The authors here desire to express their grateful thanks to Mr. J. M. Thomson, 
Demonstrator of Chemistry in King’s College, for much assistance in photography, 
and to Messrs. Groves and Brooks, Demonstrators of Physiology in King’s College, 
and to their pupils Messrs. East, Le Maistre, Norvill, Porter, Turner, and others 
for valuable aid rendered in various ways and at different periods in the course of the 
investigations. 
