SPERMATOLOGICAL METHODS. 341 



Blues. Reds. 



Methyl green. Carmine. 



Emerald green. Eosin. 



Victoria blue. " Echtroth." 



Methylen blue. Fuchsin. 



(Sometimes) Haematoxylin. Orange, 



Orange with fuchsin. 



Rosanilin sulphate. 



It was found that the chromatin (and also the nucleoli) of the female ele- 

 ments constantly took the red stain, whilst that of the male elements con- 

 stantly took the blue stain. Auerbach constantly arrives at the generalisa- 

 tion that female chromatin is erythrophilous, male chromatin cyanophilous. 



His procedure for staining was to make aqueous solutions of the two 

 colours of approximately equal intensity of tint, and either to stain in them 

 successively or to mix equal volumes of them for a staining bath. 



The subject appears to call for further research. 



