51 



"Weigh the glycerin into a tared, wide-mouthed bottle with a 

 capacity of about 60.0 mils. Place the bottle and contents in a 

 water bath, heat the water until it boils, and continue to heat for a 

 few minutes ; add the tannic acid to the hot glycerin in small suc- 

 cessive portions, agitate the mixture until the tannic acid is dis- 

 solved and strain the solution while warm through purified cotton. 



Remarks: — This is a 20% solution of tannic acid in glycerin. 

 It is used externally as an astringent protective. 



Glyceritum Phenolis 



Liquified Phenol 5.0 mils 



G-lycerin 20.0 mils 



to make 25.0 mils 



Add the Liquified Phenol to the Glycerin and thoroughly mix. 



Remarks: — This is a 20% solution of Phenol in Glycerin, but is 

 too strong for ordinary use. 



COLLODIA— COLLODIONS 



These are preparations for external use. Simple collodion is a 

 solution of Pyroxylin in Ether and Alcohol. The others have 

 simple collodion as their base. When applied, the solvent evapo- 

 rates very rapidly, leaving a film of Gun Cotton which is a good 

 protective. Three are official : 



CoUodium Collodion 



" Cantharidatum Cantharidal Collodion 



Flexile Flexible Collodion 



COLLODIUM 



Pyroxylin 2.0 Gm. 



Ether 37.5 mils 



Alcohol 12.5 mils 



to make about 50.0 mils. 



Add the alcohol to the pyroxylin contained in a suitable bottle, 

 shake the mixture thoroughly, then introduce the ether, and again 

 shake the mixture until the pyroxylin is dissolved. Cork the bottle 



