All figures drawn fiom preparati( 

 in-haematoxylin unless otherwise 



; fixed with sublimate-alcohol and stained with Heidenhain's 

 dicaied. Magnification 2,500 diameters. 



Figs. 77—85. Entamoeba histolytica. 



77, 7S. Precystic forms of E. histolytica belonging to strains proda 

 such as those shown in figs. 72—74, PI. IV. (Stained with haemalum.) 



79, 80. Precystic amoebae belonging to strains forming cysts of larger 



shown in fig.. 3-5. PI- I- 

 Si. Precystic amoeba from a stale stool. Degenerate; 



nucleus with those in figs, 77—80. 



S2. Precystic amoeba 

 (Haemalum.) 



Eviih rod-like chromatoid bodie 



f^'g 83. Precystic amoeba parasitized by bacteria. (> 



Fig. 84. Degenerate uninucleaie cyst, belonging to : 

 (Alcoholic iron-haemalein.) 



small cysts 



-such as tho 



ivaded by bacteria. Compa 



resembling ingested bacteri 



i-haematein.) 



-also parasiiized by l)acleii 



S5. Degenerate uninucleate cyst from 

 The cyst contains 3 chromatoid bodii 

 figs. 83 and 84. [For fuller descriptio 



another infection. (Weigert's iron-baematoxylii 

 s, and a number of parasitic bacteria, like those 

 1 of these forms see text, p. 63 et seq.^ 



PI. II. 



Figs. 86-8 

 cleate cyst of E. 



Figs. 87, 88, 89. Individuals nf E. nana parasitized by Sphaenta Fp. Figs. 87, 88, froi 

 specimens stained wiih haemalum: showing respectively an amoeba containing tu 

 sporangia, and one with a single spore-morula and younger stages. Fig. 89, specime 

 stained with iron-haematoxylin, containing one large and one small spore-morula. 



Figs. 90—92. Dientamoeba fragilis. 

 Figs. 90, 91. Two ordinary binucleate individuals from human stool-;. 

 Fig. 92. A uninucleate specimen. 



^'gs. 93, 94. Entamoeba gingivalis. 



Fig. 93. An individual with various cytoplasmic inclusions, and a nucleu 

 karyosome. From human mouth. (Case of pyorihoea alveolaris.) 



Fig. 94. Similar organism. Nucleus with centr.nl karyosome. (Compare 

 this Plate, and figs. o( E. coH and E. histalytifa on Plate 1.) 



PLATE V. 



OX 



-0 o 



