22 ELECTRIC VIBRATIONS OF NERVES. 



in the brain, the effect of the mechanical action 

 imparted by the hand to the cylinder is recog- 

 nized by as many different names as there are 

 lines of telegraphic nerves leading to the brain. 

 An identical electro-mechanical action transmit- 

 ted through the nerves of the eyes is denoted 

 LIGHT ; through the nerves of feeling, HEAT ; 

 through the nerves of the nose, ODOR ; through 

 the nerves of the tongue, TASTE ; and through the 

 nerves of the ear, SOUND. 



