508 



MESSRS. F. GOTCH AND V. HORSLEY 



In an early stage of our work the possibility occurred to us of investigating the 

 centres in the cerebral cortex, by the use of the electrical method, this plan having 

 been previously employed by CATON (1875). We selected the occipital lobes (see 

 fig. 26), and endeavoured by stimulation of the retina to obtain evidences of definite 



Fig. 26. 



Macacus Rhesus 



Adult 



electrical changes in the cortex of the moderately etherised Cat, consequent upon the 

 arrival therein of nerve impulses. The difficulties of effectual isolation and the 

 uncertainties of the area of connection, comprising as it does a mass of subjacent 

 nerve fibres, seemed to us to account for the indefinite and capricious character of 

 the electrical indications as displayed by the galvanometer. 



