AMCEB.E OF THE INTESTINAL TRACT. 87 



marked, although the cytoplasm is thus divided. 

 Motility is present, but is very sluggish as compared 

 to Entamceba Mstolytica. Under favorable condi- 

 tions reproduction occurs by simple division and 

 schizogony, with the production of eight daughter 

 amoebaB. If unfavorable conditions arise the organ- 

 isms encyst and eight daughter cells are formed within 

 the cyst, which are liberated under favorable con- 

 ditions. The morphology of the parasite will be 

 considered in detail, but it should be remembered that 

 individual organisms vary greatly in appearance at 

 different stages of development and that the de- 

 scription given is a composite picture which is true 

 of the vast majority of parasites belonging to this 

 species. 



Size. As a rule, Entamceba coli is not as large as 

 Entamceba Iwistolytica, although individuals are often 

 observed which approximate the size of the latter or- 

 ganism. The measurements given by different 

 authorities vary greatly, as one would expect, for 

 during the different stages of development the para- 

 sites may measure from 5 microns to 50 microns in 

 diameter, and as every specimen of feces will contain 

 organisms in different developmental stages the varia- 

 tions in size reported do not indicate inaccuracy on the 

 part of the observer. Schaudinn states that Enta- 

 mceba coli varies between 8 and 50 microns in 



