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THE HAEMOGREGARINES OF MAMMALS 
AND REPTILES. 
By Captain W. S. PATTON, M.B. Edin., I.M.S. 
(From the Quick Laboratory, Cambridge.) 
In two recent papers, Sambon and Seligmann (1907, 1908) have 
recorded some observations on the intracellular parasites of snakes, and 
have described no less than ten new species. The authors, in discussing 
the life histories of these parasites, have made the startling discovery 
that, “ the life history of the haemogregarines like that of the haemo- 
protozoa is divided into two cycles: a schizogonic or ‘ vegetative ’ 
cycle spent in the blood of vertebrates and characterised by asexual 
multiplication, and a sporogonic or sexual cycle spent in the digestive 
organs of blood-sucking invertebrates and characterised by sexual 
reproduction.” The authors then go on to speak quite familiarly of 
young merozoites , adult schizonts, adult sporonts, and so on. 
My excuse for making some remarks on their findings is the fact 
that since November, 1905, up till July, 1908, I have worked with the 
following snakes infected with haemogregarines: 
Bungarus coeruleus ( candidus) 
Vipera russellii 
Naja tripudians 
Python molurus 
Zamenis mucosus 
Eryx johnii 
Gonglyophis conicus 
Dryopliis mycterizans 
Dendrophys pictus 
Tropidonotus piscator 
Tropidonotus stolatus 
In all 250 snakes were at one time or another in the Laboratory at 
the King Institute, Madras, the majority of which harboured two species 
of Aponomma: A. gervaisi and another species not yet identified. Careful 
feeding experiments with the larvae, nymphs and adults of both these 
ticks were carried out in special receptacles, so that the conditions were 
very much as they occur in nature. In addition, I have had the 
