68 



SUPPOSITORIA. 



COLLODIA. 



Make a Suppository as follows : Dissolve I mil ichthyol in 3 Gm. glycerine ; add 

 5 Gm. melted glycerinated gelatine ; mix the ingredients thoroughly, and at once pour 

 into a small test-tube which has been coated internally with a very thin film of liquid 

 petrolatum. Cool until Suppository is firmly set. ( Keep in tightly closed containers in 

 a cool place.) 



Compare the merits of these three Suppositories : 



Suppository A: 



Suppository B: 



Suppository C: 



Also take I Gm. pieces from each, and compare their melting periods when im- 

 mersed in water of a temperature of 38 C. 



A : _ B : _ C : 



OLEATA. 



An Oleate is a solution of an alkaloid or of an oxide in oleic acid. 



Prepare the official Oleatum Hydrargyri as follows: In a tared porcelain dish 

 place 2.5 Gm. finely powdered yellow mercuric oxide, and 2 mils alcohol; mix well; 

 then add 7.5 Gm. oleic acid; warm the mixture over a water bath to a temperature 

 not exceeding 50 C., stirring constantly with a glass rod until the alcohol is expelled 

 and the mercuric oxide is entirely dissolved. Then add enough oleic acid to make the 

 product weigh 10 Gm. Mix thoroughly. 



This Oleate has to be kept in tightly closed containers, well protected from light. 

 It should not be used if globules of metallic mercury are visible. 



Properties of Oleatum Hydrargyrum: 



The Oleate of Mercury is more elegant and efficient than the corresponding oint- 

 ment, especially in the treatment of pediculosis. 



COLLODIA. 



A Collodion is a solution of pyroxylin (gun-cotton) in a mixture of ether and 

 alcohol. It is a highly inflammable liquid. When applied to a surface, the solvent 

 evaporates, leaving deposited a transparent, tenacious film. 



Prepare the official Collodium as follows: In a bottle place 2 Gm. pyroxylin, add 

 12.5 mils alcohol; thoroughly shake the mixture; then add 37.5 mils ether, and shake 



