ERRATA 



P. 251, 1. 31: For fuchsin-orange G-anilin blue, 

 read fuchsiu-orangeG- anilin blue. 



P. 259, under Zalesky 1866: For Bd. J 1, read Bd. 1 ; for Saeyler, read Seyler. 

 P. 264, under description of Fig. 16: For X 1650, read X 825. 

 I'. LliiG, under description of Fies. 21, etc.: For X 1850 </- ' 



