MICROSCOPY 109 



Frey-Wyssling, A., Suhmicroscopic Morphology of Protoplasm, 2nd 

 English ed. Amsterdam: Elsevier Publishing Company, 1953. In- 

 cludes an excellent description of the application of p>olarization 

 microscopy to biological materials. 



"Microscope." Encyclopaedia Britannica. 1956 edition. XV:434-443B. 

 This article is one of the best of the brief discussions even though the 

 subject is approached from a viewpoint somewhat different from 

 that presented in this chapter. Several excellent photographs are in- 

 cluded. 



