148 



ZOOLOGY. 



electrical ray is disturbed by the touch of any object, the 

 impression is conveyed by the sensory nerves to the brain, 

 exciting there an act of the will which is conveyed along 



Fig. 190.— Torpedo marmoratus. a, brain; b, medulla oblongata; c, spinal cord; 

 d and 6\ electric portion of the trigeminate or fifth pair of nerves; ee\ elec- 

 tric portion of the pneumogastric or eighth pair of nerves; /, recurrent nerve; 

 g y left electric organ entire; </', right electric organ dissected to show the dis- 

 tribution of the nerves; h, the last of the branchial chambers; »', mucus- 

 secreting tubes. 



the electric nerves to the batteries, producing a shock. 

 The benumbing power is lost by frequent exercise., being 



