AS COxMPARED WITH THAT OF OTHER VENOMOUS SNAKES. 129 



immediately contract like that placed in the poisoned 

 solution. 



1.30. Contracts strongly to current at 15 cm. of Du Bois 

 Eeymond's coil, more than the poisoned muscle at 11, at the 

 same moment. 



1.45. Contracts distinctly at 11, whilst the poisoned muscle 

 has lost all irritability. 



From this it is evident that the poison first stimulates the 

 muscular fibre to contract, but rapidly afterwards destroys its 

 irritability. 



Experiment XXVII. 



The gastrocnemii of a frog were again treated in the same 

 way as in the previous experiment, with precisely the same 

 results. 



June 28th. — Made several experiments with cobra-poison on 

 ciliated epithelium of frog's mouth, and found that it at first 

 accelerated, then destroyed, the action of the cilia. 



Experiment XXVIII. 

 To Test the Effects of Cobra-poison, lohen sivallowcd, on the Frog. 



June 24th, 1874. — At 2.25 p.m. about ^ of a grain of dried 

 cobra-poison was passed down a frog's tiiroat. 



2.30. Frog making violent efforts to vomit. Gaping. Head 

 thrown back tetanically. 



2.34. Bloody mucus vomited with violent efforts.* 



2.50. Moves with difficulty ; is becoming paralysed. Efforts 

 to vomit continue. 



3. Much the same. 



3.5. Very weak ; still tries to vomit. 



3.10. Eeflex action still well marked. 



3.15. Motor nerves apparently quite paralysed. 



3.20. Apparent death. 



Artificial Respiration with Pure Oxygen. 

 As life had been prolonged for many hours in snake-poisoning 

 by artificial respiration with atmospheric air, it was thought 



* This experiment is especially interesting, as showing that frogs do occa- 

 sionally vomit, a fact which has been denied by some physiologists. 



(95) K 



