General Laboratory Information 331 



17) Navashin's: 



(a) Chromic acid 1 .5 g. 



Glacial acetic acid 10 cc. 



Distilled water 90 cc. 



(b) Commercial formalin 40 cc. 



Distilled water 60 cc. 



Mix equal parts (a) and (b) just before using. 



18) Mann's: 



Picric acid 1 g. 



Tannin 2 g. 



Sat. HgCla-NaCl 100 cc. 



19) Van Gehuchtin's: 



Absolute alcohol 60 cc. 



Chloroform 30 cc. 



Glacial acetic acid 10 cc. 



3. Formula of Cleaning Fluid 

 For Slides, Cover Glasses, Etc. 



Potassium or sodium bichromate (commercial grade satisfactory) . 40 g. 

 Water 150 cc. 



Dissolve with a little heat if necessary, then cool to room temperature and add 

 the following slowly : 



Concentrated sulfuric acid 230 cc. 



