124 ON THE NATURE AND ACTION OF THE CROTALUS-POISON 



Experiment XIV. 



August 12th, 1874 — A cat was chloralised at 2.30 p.m. 

 Mesentery exposed and placed under microscope on warm 

 stage. 



Crotalus--poison applied to mesentery ; circulation soon dimi- 

 nished in some vessels but continued vigorously in others 

 Isolated extravasated patches soon made their appearance, of a 

 triangular form ; others followed and coalesced with these until 

 a network was formed in the course of the vessels all over the 

 field. The extravasation soon became general, the circulation 

 still continuing slowly. 



Experiment XV. 



A fresh portion of mesentery of same cat exposed. Intestines 

 becoming cold and circulation now very languid. 



Cobra-poison applied. 



No apparent effect produced, but the circulation is very 

 languid, indeed has almost ceased, so that the results of this 

 experiment are not conclusive. 



Experiment XVI. 



August 14th, 1874. — A cat was chloralised, part of mesentery 

 withdrawn, and placed under microscope on warm stage. 



Dried cobra-poison dissolved in a salt solution, 0*75 per cent., 

 applied to the mesentery at 4.10 p.m. 



4.14. Circulation is languid, almost ceased in some vessels. 



4.18. Slight extravasation taking place where the poison has 

 been in contact. 



4.20. Extravasation rather more obvious. 



4.35. Exposed another part of the mesentery ; examined the 

 state of the circulation before applying the poison. Blood 

 flowing languidly. 



Poison applied at 4.37 ; at first it seemed rather to accelerate 

 the movement of the blood. 



4.38. Circulation continues at same rate. 



4.42. Same rate. 



