148 



ZOOLOGY. 



electrical ray is disturbed by the toncli 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 



Fio. I'iO.— Torpedo maminraius. a, brain; h, medulla oblongatat c, spinal cord 

 d and h\ electric p<irtion of the ti-igerninate or fifth pair of nerves; t'e', eiec 

 trio portion of tliepneinnogastric or eigiitli pair of nerves;/, recurrent nerve 

 g, left electric organ entire; g\ riglit electric organ dissected to show the dis- 

 tribution of the nerves; hy the last of the branchial cliambers; i, mucus- 

 secreting tubes. 



the electric nerves to the batteries, producing a shock. 

 The benumbing; power is lost by frequent exercise., beine; 



