THE FOEE-BRAIN 



539 



Prochaska (1749-1820) made notable progress in defining the/ 

 seat of mental phenomena. He held the brain in general to be 



I'A M >/ W &?$&& 



FIG. 272. Diagram to show the layers of cells'andjfibres in the grey matter of the human cerebra 

 cortex, according to three histological methods : (a) Golgi ; (6) Nissl ; (c) Weigert. (0. Vogt.) 



the organ of thought, but believed it not improbable that the 

 different acts of intelligence have distinct organs in the brain. 



