POISON OF SOME INDIAN VENOMOUS SNAKES. 53 



Immediately after the injection the frog became very excited 

 and jumped about very much. 



12.20. Frog quiet. Eespiration quick. 



2.30. Frog quiet, but jumps when irritated. It seems to use 

 both legs equally well. 



January 15th. — The frog is not dead, but is feeble. On 

 killing and opening it, both legs contracted nearly equally 

 when the lumbar nerves were stimulated by an induced 

 current. 



Experiment XXXII. 



January 15th. — Tied the heart of a frog, and, 12.55 p.m., 

 injected into the right leg a drop of water, and into the left leg 

 a drop or two of cobra-poison. 



1.55. — Irritated the back of the frog by an induced current. 

 Both legs contracted nearly equally. 



Experiment XXXIII. 



May 9th. — A frog {Rana tcmporaria) was poisoned with 

 curare. After complete paralysis had set in, the right leg was 

 ligatured, with the exception of the sciatic nerve. The animal 

 was then poisoned by the introduction of a solution of dried 

 cobra-poison in water into the lymph-sac on the back, at about 

 12.30 P.M. The irritability of the muscles was tested by single 

 induced currents applied to the denuded muscles, about 2.30. 



Distance of Coil. 



Left leg 7'5 , Contraction. 



Eight leg 7-2-7-5 do. 



Another frog was curarised and similarly prepared, with this 

 exception — that the vessels of the right leg only were ligatured, 

 the muscles, as well as the nerve, being left free. This frog was 

 also examined in the same way ; and the irritability of the 

 muscles in both legs was found to be almost exactly the same 

 three to four hours after poisoning. Both contracted with the 

 coil at about 7"5. 



