42 
Bat Xo, S. — Moderate number of encysted parasites on eighth day ; 
tenth day marked anemia, many free and encysted parasites. Fotmd 
dead on moiTiing of twelfth day. 
Hemorrhagic spots on surface of lungs: blood in 
small intestine : other lesions as in Xo. 1. 
Bat So. Jf.. — Few encysted parasites on ninth day : moderate num- 
ber on twelfth day. On fortieth day an occasional parasite ob- 
seiwed: animal appeal's healthy. 
Bat So. 5. — Small number of free and occasional encysted parasites 
on eighth day : tenth day encysted forms numerous : moderate ane- 
mia : death on twentieth day. 
Post-mortem. — Spleen greatly enlarged: hver mottled yellow; 
many parasites in blood. 
Bat So. 6. — Encysted parasites in small numbers on twelfth day: 
moderately numerous on twentieth day: animal sick. On fortieth 
day a few encysted forms still present : animal appears healthy. 
Bat So. 7. — Few free and many encysted parasites on ninth day; 
more abundant on twelfth day: animal anemic, appears sick: leuco- 
cystes greatly increased. Increasing anemia and death on twentieth 
day. 
Post-mortem. — Spleen four times noimal size: liver enlarged and 
fatty: mesenteiic lymph glands enlarged and hemorrhagic. 
Bat So. 8. — Small number of encysted parasites on eleventh day : 
on fifteenth day considerably increased: anemia apparent. On 
fortieth day animal still ahve, but qtiite sick and anemic. 
Bats Sos. 9 and 10 — Control rats. — Were examined in the same 
manner as the infected ones. Xo parasites found in the blood at any 
time. Animals healthy on the fortieth day. 
On none of the rats were mites or other ecto-parasites found. The 
jars in which the rats were confined were placed at some chstance m 
the laboratory fi'om those containing infected mites and were further 
protected by a ring of vaseline. 
In a later experiment, earned out in the same manner, five rats 
were used. Four were fed vdth ripe cysts on wet bread. The earhest 
appearance of encysted parasites in the blood was on the eighth day 
in two rats: in the other two on the tenth day. Vermicides alone 
were observed in thi'ee on the second day. One rat died on fifteenth; 
the other on nineteenth day. 
In a still later experiment four young rats ( 2 months old) were fed 
as in the previous experiments. Encysted parasites were found in 
the blood on the tenth, twelfth, thirteenth, and fourteenth day, 
respectively. All four died v-ithin a week after the appearance of 
infection. 
Kz:MAnE:s.— Parasites spoken of as “encysted” refer to those forms 
inclosed in cysts and usually contained in mononuclear lymphocytes. 
