TPEIB NATURE AND EFFECTS. 25 



12.48^ P.M. Injection. 



18.68 P.M. Reflex movement ceased. 



1.40 P.M. Muscles of left or poisoned leg contracted 

 with 2.43 volts. 



• 1.40 J P.M. Muscle of right or non-poisoned leg with 

 1.89 volts. 



1.44^ P.M. Nerve on poisoned side caused contrac- 

 tion in muscle when excited by 10'8 volts. 

 , 1.46 PM. Non-poisoned nerve with 0'.54 volts. 



In this experiment the sensitiveness both of the non- 

 poisoned muscle and nerve, in comparison with that of 

 the poisoned side, was greater than even in the former 

 experiment. 



These experiments seem to make it probable that 

 cobra-poison has some special property in deadening 

 the terminations of the motor nerves; and Sir Joseph 

 Fayrer and Dr. Brunton have, in support of this view, 

 given some experiments in which, on irritating the 

 spinal cord with an induced current, contraction was 

 caused in the non-poisoned leg, but not in the poisoned. 



The following experiment had for its object to ascer- 

 tain if the mechanical excitement of the cord could be 

 transmitted through the poisoned nerve. 

 Experiment X. 



A frog {Rana tigrina) had 0"5 cubic centimetre of 

 fresh cobra-poison injected into its dorsal sac at 2. 12 p.m., 

 the right thigh, with the exception of the sciatic nerve, 

 having been previously ligatured. 



