432 
Eimeria n. sp. in Man 
So this sudden incidence and abrupt termination of the infection (or, at least, 
of cyst production), and the absence of clinical symptoms seem to be peculiar 
properties of the intestinal coccidial infections in man , and are certainly no 
obstacle to the acceptance of our third supposition. 
'Thus it may be concluded (though I must admit the impossibility of 
proving it to the hilt) that the explanation which lies nearest to truth is that this 
case is one of parasitization of man by a hitherto undescribed Eimeria, which 
is probably peculiar to this host. 
The solution of the difficulties which we always meet with in rare infec¬ 
tions, viz. the sources of infection, the modes of transmission, and the ways 
by which the infecting species preserves its continuity, must be reserved for 
further investigations. 
Medan, July 1920. 
REFERENCE. 
Dobell, C. (1919). A revision of the Coccidia parasitic in Man. Parasitology , xi. 147. 
