118 



SEX IN MICROORGANISMS 



Plate I. Stages in copulation of ChlmnydoDWiuis 7/ioewusii Gerloff. 

 (Electron micrographs: Pd-shadowed, 7:1) 



1, Agglutination of flagella (X 1500); 2, formation of protoplasmic! bridge and 

 dissociation of flagella (X2500); 3, protoplasmic bridge (X4000); 4, vis-a-vis pair 

 (X 3000). 



The electron microscope was made available by kind permission of Dr. J. L. 

 Melnick, of the Section of Preventive Medicine, Yale University; and much valuable 

 assistance was received in its operation from Airs. J. C). Aleinliart and Dr. W. 

 Gaylord. 



