6 rrejace 



Chromatography, a still more recent method of dye identifica- 

 tion, is discussed in this edition for the first time. It is not treated 

 extensively, however; its importance is appreciated, but methods 

 of applying it have not yet been suiBSciently standardized to justify 

 its routine use in stain identification. Perhaps the brief references 

 to the method given in this edition will stimulate the research the 

 method needs to make it a more useful tool in this work. 



Users of the book will also notice that there has been a slight 

 rearrangement of the material, with the chapter on Theory of 

 Staining placed earlier in the book and one additional chapter 

 added to include Miscellaneous Dyes, Pigments and Histochcmical 

 Reagents. 



H. J. Conn 

 Geneva^ N. Y. 

 October, 1952 



