PHASE-CONTRAST MICROSCOPY 93 



observed by dipping them in paraffin oil. Figures 2.25, 2.26 and 2.27 

 show several phase-contrast micrographic samples. 



To sum up, while phase-contrast potentialities are considerable in 

 many fields, it requires special regard if full sensitiveness of the process 

 is to be taken advantage of. Specimens are to be as thin as possible: 

 thicker specimens always yield unsatisfactory images which are difficult 

 to construe. 



