y^zw^/l»fi 



29 '^ %^s 30 |jy**^%^| 



Plate I. Figures 1 to 27 represent living cells in slide cultures (Stenipen 

 and Hutchinson, 1951a). Figures 28 to 31 represent cells from osniiuni-fixed 

 and fuchsin-stained preparations made from 6-hour-old cultures (Stempen and 

 Hutchinson, 1951b), 



34 



