259 



the fact that Dr. A. C. Stevenson, of the Pathological Department, 

 University College, had just begun to examine the newt's blood. He also 

 independently found the parasite described in this paper and corro- 

 borated many of my observations. I would gratefully acknowledge 

 his extreme courtesy in showing me his preparations. Dr. Stevenson 

 used the Leishman stain, which I have also tried with success. 



Fis. 3. 



Fi"-. 4. 



Fi^. 5. 



Fier. 6 



Fio-. 7. 



Fiff. 8. 



Fiff. 9. 



Fiff. 10. 



^ . 



Fiff. 11. 



Fiiî. 12. 



Fig. 13. 



Fig. 14. 



• • • 



• •; 



Fig. 15. 



Fiff. 16. 



Fier. 17. 



Figs. 3 to 17. Various stages in the life history of the haemogregarine, di-awn under 

 a magnification of 2100; drawings subsequently enlarged twice. In each figure the 

 parasite is shown surrounded by some of the cytoplasm of the blood-coqîuscle, as a 

 background. The outline of this background should in all cases be soft and iiTegular. 

 For further explanations, see the text. 



In addition to blood-films, thin smear-preparations of the spleen- 

 pulp and liver, and sometimes of the kidney, bone-marrow and 



18* 



