PLUMBUM. 59 



Plumbi Oxidum or its Emplastrum is also con- 

 tained in Emplastra Ferri, Galbaui, Hydrargyri, Resinse, 

 Cerati Saponis, and Saponis. 



From Plumbi Oxidum is made : 



Plumbi Acetas. Acetate of Lead. "Sugar of 

 Lead." Pb(C 2 H 3 2 ) 2 .3H 2 0. 



Source. Made by dissolving Oxide of Lead in Acetic 

 Acid and Water, and crystallising. PbO + 2C 3 H 4 2 = 

 Pb(C 2 H 3 O 2 ) 2 + H,0. 



Characters. White spongy-looking masses of inter- 

 laced acicular. crystals, slightly efflorescent, having an 

 acetous odour and a sweet astringent taste. Solubility, 

 10 in 2o of water. 



Incompatibles. Hard water, mineral acids and salts, 

 vegetable acids, alkalies, lime-water, iodide of potas- 

 sium, all vegetable astringents, preparations of opium, 

 albuminous liquids. 



Impurity. Carbonate ; detected by turbidity of 

 aqueous solution. 



Dose. 1 to 4 gr. 



Preparations. 



a. Pilula Plumbi cum Opio. Acetate of Lead, 

 6 ; Opium, 1 ; Confection of Roses, 1. A 4-gr. pill 

 contains 3 gr. of plumbi acetas, and gr. of opium. 



Dose. 3 to 5 gr. 



b. Suppositoria Plumbi Composita.- Each 15- 

 gr. suppository contains 3 gr. of acetate of lead, 

 and 1 gr. of opium. 



c. Unguentum Plumbi Acetatis. 12 gr. to 1 

 oz. benzoated lard. 



d. Liquor Plumbi Subacetatis. " Goulard 

 extract." Pb.,C 4 H 6 5 , dissolved in water. 



Source. Made by boiling acetate of lead and 

 oxide of lead in water. 



Characters. A dense, clear, colourless liquid, 

 with a sweet astringent taste and alkaline n-action. 



From Liquor Plumbi Subacetatis are prepared : 



a. Liquor Plumbi Subacetatis Dilutus. 

 " Goulard Water." Solution of Subacetato of 

 lead, 1 ; Rectified spirit, 1 ; Water, 78. 



|8. Unguentum Plumbi Subacetatis Com- 

 positum. 1 in 5f. 



