STAINING CHKOMATOPHORES. 61 



in this for several, even up to as many as twenty-four, hours. 

 They are then washed as rapidly as possible in running water and 

 can be examined in glycerine, or dried and mounted in Canada 

 balsam. They must not, however, be treated with alcohol, as the 

 stained chromatophores would be decolorised. 



