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 murmoratus, @, cerebrum; 0, the medulla; ¢, spinal cord 3 
dand 0’, electric portion of the trigeminate or fifth pair of nerves; ¢e’, electric portion 
of the pneumogastric or eighth pair of nerves; f, recurrent nerve; g, left electric 
organ entire ; g right electric organ dissected to show the distribution of the nerves ; 
h, the last of the branchial chambers ; 2, 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 experiments on 
the torpedo, examining the discharge of this fish with the 
