PLATE 1 



EXP'LANATION OF FIGURES 



All figures, with the exception of figure 47, were drawn with the aid of the 

 camera lucida at the level of the base of the microscope. The magnification, 

 where not otherwise specified, is 1550 diameters. All figures, where not other- 

 wise noted, were drawn from sections of the urinary bladder fixed in formol- 

 corrosive-acetic' and stained with iron hematoxylin and congo red. 



Figures 1 to 55 are of the disporous, figures 56 to 89 of the polysporous form. 



1 Living vegetative trophozoite shortly after being placed on the slide. 



X 1400. 



2 Living vegetative trophozoite with two erythrocytes in the endoplasm. 



X 1400. 



3 Small mononuclear cell the nucleus of which is surrounded by a thin layer 

 of homogeneous cytoplasm. Giemsa smear. 



4 and 5 Cells with two nuclei but otherwise similar to figure 3. Giemsa smear. 



6 Cell with homogeneous cytoplasm and two nuclei which appear to be fus- 

 ing. Giemsa smear. 



7 Mononuclear trophozoite with homogeneous cytoplasm which is not as 

 abundant as is usually the case at this stage. Giemsa smear. 



8 Mononuclear trophozoite in which the cytoplasm is more abundant than 

 in figure 7 and is also distinctly granular. Giemsa smear. 



9 Mononuclear trophozoite similar to figure 8. At one side can be seen the 

 pseudopodia by means of which it was attached to the urinary epithelium. 



10 to 12 Binuclear trophozoites larger than figures 4 and 5 and with granu- 

 lar cytoplasm. 



13 to 15 Binuclear trophozoites in which each nucleus is plainly surrounded 

 by a specially differentiated area of the endoplasm. Figure 13 from a Giemsa 

 smear. 



16 Trophozoite with three nuclei of approximately same size. No specially 

 differentiated area of endoplasm could be distinguished around the nuclei. 



17 Trophozoite with three nuclei one of which is considerably larger than the 

 others. Giemsa smear. 



18 Similar to figure 17 except that a specially differentiated area of endoplasm 

 could be distinguished around each of the smaller nucler. Giemsa smear. 



19 Similar to figure 18 except that the structure of the larger (vegetative) 

 nucleus is plainly unlike that of the other two. Giemsa smear. 



20 Two trophozoites, one with only three, the other with four nuclei. Giemsa 

 smear. 



21 Two trophozoites, one with three, the other with four nuclei. In each 

 trophozoite the vegetative nucleus can be easily distinguished. At the right 

 can be seen the pseudopodia by means of which they were attached to the urinary 

 epithelium. 



22 Trophozoite with four nuclei. The three generative nuclei are inclosed 

 in distinct cells. 



23 Trophozoite with five nuclei. Three of the four generative nuclei are 

 inclosed in distinct cells, which can be made out only with difficulty. No definite 

 sporoblasts can be distinguished. 



364 



