398 METHODS IN PLANT HISTOLOGY 



Millon's reagent. — 



Mercury 1 c.c. 



Concentrated nitric acid 9 c.c. 



Water 10 c.c. 



Cuprammonia. — 



Prepare by pouring 15 per cent ammonia water upon copper turn- 

 ings or filings. Let it stand in an open bottle. 



Phloroglucin. — 



Use a 5 per cent solution in water or alcohol. 



Celloidin. — 



To make a 2 per cent solution, add one tablet of Schering's celloidin 

 and enough ether-alcohol (equal parts absolute alcohol and ether) to 

 make the whole weigh 2,000 g. 



Where only a small quantity is needed, shave off 2 g. of celloidin 

 and add 100 c.c. of ether alcohol. 



Eycleshymer's clearing fluid. — 



Mix equal parts of bergamot oil, cedar oil, and carbolic acid. 



Cellulose acetate. — 



Cellulose acetate 12 g. 



Pure acetone 100 c.c. 



Mrs. Wilhamson recommends the cellulose acetate sold by Cellon, 

 Ltd., 22 Cork Street, London, W. I., England. 



Glycerin jelly. — 



One part (by weight) of finest French gelatin is left for 2 hours in 6 

 parts (by weight) of distilled water. Add 7 parts of glycerin and for 

 every 100 g. of the mixture add 1 g. of concentrated carbolic acid. 

 Warm the whole mixture for 15 minutes, stirring all the time, until all 

 the flakes produced by the carbolic acid have disappeared. Filter, 

 while still warm, through a fine-meshed cheesecloth. 



Venetian turpentine. — 



To make a 10 per cent solution, add 90 c.c. of absolute alcohol to 

 10 c.c. of thick Venetian turpentine. Stir it with a glass rod. Guess at 

 the amount of turpentine, for it is not easy to clean things which have 

 contained Venetian turpentine. 



