52 



well and set it aside until the liquid becomes clear. Finally decant 

 the clear portion from any sediment which may have deposited and 

 transfer it to containers which must be well closed. Keep the collo- 

 dion in a cool place remote from fires. 



CoLLODiuM Plexile — Flexible Collodion. 



Collodion 19.0 Gm. 



Camphor 0.4 Gm. 



Castor Oil 0.6 Gm. 



to make 20.0 Gm. 



Weigh the ingredients successively, into a tared bottle, and 

 shake the mixture until the camphor is dissolved. Keep the product 

 as in case of collodion. 



Remarks: — This is the preparation mostly used because coUo- 

 dium is brittle and the film is liable to crack when applied to joints 

 or other movable parts. 



OLEATA— OLEATES 



These were formerly defined as solutions of oxides or alkaloids 

 in oleic acid but in the revision of the Pharmacopoeia of 1910 but 

 one is official, "Oleatum Hydrargyri" — so that oleate would be 

 defined as a solution of an oxide in oleic acid. Oleates are applied 

 by inunction and depend upon absorption from the skin for their 

 physiological action. As stated above they are prepared by dissolv- 

 ing an oxide or an alkaloid in oleic acid. An excess of heat should 

 be avoided in making metallic oleates, as the acid easily reduces the 

 metals, especially when heated. 



Oleatum Hydrargyri — Oleate of Mercury. 



Yellow Mercuric Oxide, in very fine powder 5.0 Gm. 

 Alcohol 4.0 mils 



Oleic Acid, a quantity sufficient 



to make 20 Gm. 



Mix the yellow mercuric oxide with the alcohol in a tared 

 mortar ; add 15 grams of oleic acid, warm the mixture to a tempera- 



