# 



mm * ^ 



4K 



t 





1^ 





V 



Fig. 6-18 Photographs of cells stained by Rafalko 

 with his modified Feulgen. The deeply stained chromosomes 

 in the vacuole are clearly visible. I am indebted to Dr. 

 Rafalko for permitting me to photograph his preparations. 

 The heterochromatin outside the vacuole can be seen clearly 

 in two of the photographs. These photographs are made with 

 the phase-difference microscope which intensifies the light 

 color of the Feulgen stain. 



6-24 



