PLATE II 



Fig. I. — External surface of the left hemisphere of brain of an intellectual man shewing 



a complex convolutional pattern. 



Foot & Toes 

 Knee 



Hi P- JZ 



Shoulder * 



Elbow- 

 Written Speech- 

 Hand 

 Index- 

 Thumb- - 



Upper 



Face 



Lower 



Face 



Motor _ . 

 Speech 

 Tongue" - 

 Larynx- 



Movements of 



Eye (probable) Taste 



and 

 Smell 



Great Toe 



Tactile & Muscular sensation 



Visual word, 

 Memory 



Hearing, 

 Auditory word 

 Memory 



Half Vision centre 



Fig. 2 — The same hemisphere as fig. I, to show the various areas of ascertained definite 



physiological function. 



The coarse black dots in the precential region indicate points which when electrically excited give rise to 

 definite movements. Behind the central fissure the cross shading indicates the region of tactile 

 muscular sense. A large part of the auditory centre cannot be seen as it forms the floor of the posterior 

 part of the sylvian fissure. The greater portion of the half vision centre lies on the mesial surface and 

 cannot be seen. The sensory speech centres are indicated by oblique shading ; the motor speech 

 centre of Broca is indicated by fine dots, and above it the centre for writing. Destruction of these 

 centres causes motor aphasia and agraphia. 



