THE ELECTBIGAL BAT. 



433 



producing a shock. The benumbing power is lost by fre- 

 quent exercise, being regained by rest ; it is also increased 

 by energetic circulation and respiration. As in muscular 



Fig. ZIH.— Torpedo marmuralus. a, cerebrum : 6, the medulla ; c, spinal cord ; 

 d and &', electric portion (jf the trigeminaie or fifth pair of nerves ; ee'^ electric portion 

 of the pneumogaatric or eighth pair of nerves ; /, recurrent nerve ; g, left electric 

 organ entire ; g\ right electric organ dissected to show the distribution of the nerves ; 

 A, the last of the branchial chambers ; i, mucus-secreting tubes.— From Gervais and 

 Van Beneden. 



exertion the electrical power is increased by the action of 

 strychnine (Owen). 



Marey has more recently made interesting exj^eriments on 

 the torpedo, examining the discharge of this fish with the 



