to 8/u by i/i to i '5//. Some residual protoplasm is found in the 
remains of the schizont after the merozoite formation is completed. 
The merozoites escape (fig. 8) from the tenuous envelope of the 
schizont and become free-living forms (fig. 9) in the blood of the 
spleen. But their free stage of existence is of short duration. Leuco¬ 
cytes or immature erythrocytes are encountered, and the young 
merozoites penetrate the host cells and enter upon the trophic phase 
of their existence, ultimately differentiating either as sexual individuals 
or as schizonts. 
The occurrence of schizogony in L. lovali is very difficult to 
demonstrate. Though many infected birds may be examined, 
schizogony may not be detected, for the period of schizogony may not 
be attained, and also this form of multiplication is passed through with 
remarkable rapidity, so that merozoites may be formed and dispersed 
before the investigator has had time to examine the material available. 
Rapidity of schizogony is also found in such parasites as Coccidia , 
where often it is not easy to obtain preparations exhibiting schizo¬ 
gony, while some gametocytes can usually be obtained in any 
preparation from an infected host. In connection with schizogony of 
Leucocytozoa , great interest attaches to the discovery of Mathis and 
Leger of periodic increases in the number of the gametocytes of L. 
caulleryi in the peripheral blood of its host, the domestic fowl of 
Tonkin, for which increase no explanation has hitherto been afforded. 
It seems to me that during the intervals between successive crops of 
parasites, asexual multiplication probably occurs. As in L. lovali 
schizogony occurs in an internal organ, namely, the spleen, it is sug¬ 
gestive that a similar condition prevails in L. caulleryi \ and as in 
other Protoza, the schizogony culminates in sexual differentiation, so 
in L. caulleryi it seems likely that a similar sequence may occur. 
It may be added that preparations of bone marrow of the infected 
birds did not furnish schizonts, though it is possible that schizogony 
might be found to occur therein, if abundance of material were avail¬ 
able for research. L. lovali did not appear to be very harmful to the 
grouse investigated, and in the two cases in which schizogony occurred, 
no other protozoan parasite was present in the blood of the grouse, all 
°f whose organs were minutely examined. 
I- lova/i may be transmitted from grouse to grouse by the agency 
°f the grouse-fly, Ornithomyia lagopodis, for vermicules devoid of 
