FLAGELLATED ORGANISMS IN THE BLOOD OF ANIMALS. 363 



rat. A slide of blood which had been kept in a moist chamber 

 for twenty hours having been placed under the microscope, the 

 eye was attracted by the way in which one of the parasites 

 appeared to play with a red blood-corpuscle. It was watched 

 for fully an hour, until, in fact, the field was disturbed by the 

 evaporation along the edge of the cover-glass. Its movements 

 were sluggish and just sufficient to slightly shift the corpuscle. 

 It had not attached itself to the corpuscle by either of its ends, 

 but at a spot about 8 fi from the point of the thicker end as 

 shown in Fig. 2, a to d. Sometimes there appeared to be a 

 slight interval between the corpuscle and the parasite (Fig. 2, a), 

 and occasionally even a greater interval than is indicated in 

 the woodcut, but both parasite and corpuscle, nevertheless, 

 continued to move in unison, as though some filamentous con- 

 nection existed between them, which, however, was too delicate 

 to be distinguished by the highest power which I possessed. 

 At other times the organism appeared to be closely applied to 

 the corpuscle, as though the latter were being embraced by 

 two short lateral pseudopods, and the outline of corpuscle 

 appeared as if squeezed (Fig. 2, b, c). At Fig. 2, d, the cor- 

 puscle is shown with the parasite immediately below it. No 



Fig. 2. — a — d appearances presented by one of the flagellated organisms which 

 had applied itself to a red blood-corpuscle, x 1000 diameters. 



distinct flagellum could be detected extending from the thicker 



