2106 



Journal of Applied Microscopy 



We may also occasionally find a red blood cell doubly infected with this 

 young form of parasite when the cell nucleus will be found to have been shoved 

 down nearly to one end of the corpuscle. (PI. 3, Fig. "2.) 



Langmann, I believe, records several cases of multiple infection of the 

 mature parasite, but is silent upon the multiple infection by young parasites. 



In continuing their growth the ellipsoid form of the young parasite becomes 

 still further elongated and assumes the form of a crescent or bean. Their nuclei 

 will be found in various parts of the body, though usually they are located near 

 the center. 



Even at this early stage of the parasite's development the body will be seen 

 to contain granulations and other characteristic markings. (PI. 2, Figs. 5, 6 and 

 7. PI. 1, Fig. 9. PI. :], Figs. 4 and 5.) 



From this stage of its development until fully mature, the parasite undergoes 

 no material change of form, except that it increases in size, and may eventually 



Plate I. 



Plate II. 



become so large as to practically fill the blood corpuscles, and at the same time 

 crowd the nuclei nearer and nearer towards one end of the cells. (PI. 1, Figs. 2, 

 3, 4, 5, 6, 7, 8 and 10. PI. 2, Figs. 8, 9, 10, 12; also Figs. 11 and 13. PL 3, 

 Fig. 5, which shows the parasite in its extra-corpuscular form.) 



The parasite shown in PI. 2, Fig. 11. differs in some respects from the general 

 run of parasites observed by me in the blood of the Damonia revesii turtle. It 

 will be observed that in this particular parasite the chromatin of the nucleus is 

 stretched out lengthwise, nearly extending from one end of the parasite to the 

 other, whereas usually the parasitic nucleus is round or ovoid in form. 



In PI. 3, Fig. 5, we also find another deviation from 

 the regular order of things. The parasite in question 

 was noticed to be surrounded by a faint colorless zone, 

 or halo, which suggested the possibility that the para- 

 sites are surrounded by a capsule. As this, however, 

 was the only parasite out of a great many, which was 

 surrounded by a colorless zone, I am at present unable 

 Plate III. to throw more light upon the subject. 



