24 Professor Halford. 



three rabbits killed one by a cobra, the second by a 

 rattle-snake, and the third by an African puff-adder. 

 I sent one to Professor Burdon-Sanderson, then of 

 University College, one to Professor Klein of St. 

 Bartholomew's, and one to Dr. Stewart, then of 

 St. Thomas', and now of the Royal College of Surgeons, 

 England. 



RESULTS. 



In the blood of the rabbit bitten by the rattle-snake, 

 sent to Dr. Burdon-Sanderson, not a trace of these cells 

 could be seen after the most careful examination. I 

 was there and did not see them. In the blood of the 

 rabbit bitten by the cobra, sent to St. Thomas', the 

 cells were in abundance, and both Dr. Stewart, then 

 President of the Microscopical Society of London, and 

 Dr. Greenfield, then of the Brown Institution, and now 

 Professor of Pathology in the University of Edin- 

 burgh, saw them readily. They were also in 

 abundance in the blood of the rabbit bitten by the puff- 

 adder, sent to St. Bartholomew's. I was very anxious 

 to get Dr. Klein's opinion as to what the cells were ; 

 but he said he could not understand them, arid that he 

 had never seen such appearances in any previous blood 

 that he had examined. He was just starting for 

 Egypt to study cholera. There the matter has rested 

 until the fortunate arrival of Dr. C. J. Martin at 

 Sydney. 



The Origin of these Cells. 



Before beginning to describe what I have myself 

 seen and thought, I must make an extract from the 



