CONTENTS. 



PAGE. 



Introduction 71 



Method: 



(a) Preparations of the cultures: 



(1) Tissue and media 71 



(2) Cultivation 72 



(6) Observations: 



(1) Livinp;: 



Continuous observation 73 



Vital standing 74 



(2) Fixed 75 



The binucleate cell 76 



(d) Incidence 76 



(6) Morphology 77 



The binucleate cell — Conlinunl. page. 



(c) Origin: 



(1) Theoretical 80 



(2} Observations: 



Living 82 



Fixed 83 



(3) Mechanism SC 



(</) Fate: 



(1) Observations: 



Living and fixed 89 



Nuclear Fragmentation 98 



Summary 100 



Literal ure cit ed 103 



Explanation of plates 105 



