AMQEB.E OF THE INTESTINAL TRACT. 189 



then divides into two well defined portions, each con- 

 taining a large mass of chromatin and several small 

 granules of the same substance, the large mass being 

 situated at one side of the nucleus. The chromatin 

 apparently increases in amount during this process 

 of division and some of it is distributed to the cyto- 

 plasm. A cyst wall is gradually developed, and the 

 two nuclei each divide, thus forming the nuclei of 

 four young amoebae. 



During this process of reproduction the chromatin 

 at certain stages of development occurs as round 

 or band-like masses, often spindle-shaped, and several 

 such masses may be scattered through the cytoplasm. 

 Later these masses collect into compact groups, some 

 of which take part in the formation of the nuclei 

 of the young amoeba? while some fuse into one or 

 two very compact masses which remain in the cyst 

 as residual bodies. 



Conjugation. I have observed what appears to 

 be conjugation in this species of amoeba, the process 

 being similar to that described for Entamceba his- 

 tolytica. The two conjugants appear to fuse to- 

 gether and an interchange of the cytoplasm is prob- 

 able, as there are well marked streaming movements 

 of the cytoplasm perceptible in the endoplasm of 

 both organisms. In the instances of this process 

 that I have observed these phenomena lasted for 



