AMCEB^E OF THE INTESTINAL TRACT. 93 



others is still undetermined. These bodies are better 

 differentiated in stained preparations. 



Red blood corpuscles are rarely observed in the 

 cytoplasm of Entamceba coll, and this point is of 

 some value in the differentiation of the species. When 

 present, the cytoplasm never contains more than one 

 or two, and I believe that they are of purely accidental 

 occurrence and that normally this parasite is not 

 phagocytic for red blood corpuscles. Experimentally 

 it is almost impossible to make these parasites engulf 

 the erythrocytes when blood is added to feces con- 

 taining them, although in the case of Entamoeba 

 histolytica, the engulfing of these cells occurs very 

 frequently. 



The development of the daughter-nuclei during 

 schizogony has already been noted. These bodies ap- 

 pear within the cytoplasm as oval, slightly refractive 

 areas, measuring from 3 to 5 microns in diameter 

 and lying within the endoplasm. They may be easily 

 mistaken for vacuoles by one untrained in the study 

 of amoebae. In stained specimens these bodies take 

 the chromatin stain. 



Nucleus. The most prominent body in the cyto- 

 plasm of Entamoeba coll is the nucleus, which is 

 almost always distinctly visible, thus differentiating 

 this parasite from Entamoeba histolytica, in which 

 the nucleus is generally invisible. 



