THE ELECTRICAL RAY. 



423 



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. 392. Torpedo murmoraius. , cerebrum : 6, , the medulla ; c, spinal cord ; 



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

 Van Beneden. 



exertion the electrical power is increased by the action of 

 strychnine (Owen). 



Marey has more recently made interesting experiments on 

 the torpedo, examining the discharge of this fish with the 



