UNIVERSITY OF CALIFORNIA PUBLICATIONS 



IN 



ZOOLOGY 



Vol. 20, No. 13, pp. 313-332, plates 29-31 May 20, 1922 



MITOSIS IN THE ENCYSTED STAGES OP 

 ENDAMOEBA COLI (LOESCH) 



BY 



OLIVE SWEZY 



CONTENTS 



PAGE 



Introduction 313 



Acknowledgments 315 



Morphology 315 



Mitosis : 317 



Prophase 317 



Metaphase 319 



Anaphase 320 



Telophase - .- ^ ^^ 320 



Discussion ^,«<r^r^^,,.4^,^5!^yp^^^ 321 



Summary .^^^1 ^MpSr ^^5 



Literature cited y..^. .X— .V 325 



Explanation of plates Iwy j-'-^-W— ;.-']— -fftO'J ■^•V- - 328 



A complete study of the various phases of the life history of the 

 intestinal amoebae of man is confronted by several difficulties which, 

 thus far, have proved almost insurmomitable. One of these is the 

 difficulty of culturing these parasites outside of the human body. It 

 is true that cultures have been, made which yielded an abundance of 

 amoebae (for example, Yo.shida, 1920), but, in most cases at least, 

 either the amoebae have not been the true intestinal species, or they 

 have shown undoubted evidences of degeneration which render them 

 unsuitable for further investigation, either cytological or develop- 

 mental. In the latter case, the amoebae are possibly only those which 

 sui-vived from the original inoculation in a more or less degenerate 

 condition. 



