3 Unguentum Plumbi Acetatis. 4; Paraffin Ointment, white, 

 96. 



a Liquor Plumbi Subacetatis Fortis. (Goulard's Extract). A 

 clear colourless liquid with a sweet astringent taste and an alkaline re- 

 action. 



liquor Plumbi Subacetatis Dilutis. (Goulard's Lotion 

 or Water.) 1.25; Alcohol, 1.25; Water to 100. 



2 Glycerinum Plumbi Subacetatis. 15; Lead Oxide, 10.5; Gly- 

 cerin, 50; Water, 36: boiled together and partly evaporated. 



3 Unguentum Glycerini Plumbi Subacetatis. 16.5; Paraffin 

 Ointment, white, 82.5. 



2 Plumbi Carbonas. A hydroxycarbonate, 2(PbCO 3 ), Pb(OH) 2 . 

 A soft heavy white powder, insoluble in water. 



3 Unguentum Plumbi Carbonatis. 10; Paraffin Ointment- 

 white, 90. 



3 Plumbi lodidum. Lead Iodide, Pbh- A heavy bright yellow> 

 tasteless and odourless powder. Soluble 1 in 200 of boiling water. 



3 Emplastrum Plumbi lodidi. 10; Lead Plaster, 80; Resin. 

 2. 



3 Unguentum Plumbi lodidi. 10; Paraffin Ointment, yellow, 

 90. 



Plumbi Oxidum. Lead Oxide (Litharge). Heavy pale yellow- 

 ish-red scales. Insoluble in water. 



iEmplastrum Plumbi. Lead Plaster. 25; Olive Oil, 50; 

 Water, 25; boiled gently for several hours. An oleate of lead is formed. 



Podophylli Rhizoma. Podophyllum Rhizome. The dried 

 rhizome and roots of Podophyllum peltatum. Dark reddish-brown, smooth 

 or slightly wrinkled, nearly cylindrical pieces, several inches in length and 

 about 1/3 inch in diameter, with enlargements about 2 inches apart, which 

 bear on their upper surface the scar of an ascending stem and on the lower 

 surface numerous roots. Odour, characteristic, taste slightly acrid and 

 bitter. 



1 Podophylli Resina. Dose, %-\ gr. ; 15-60 mgms. 



The resinous precipitate formed by pouring a partially evaporated alco- 

 holic extract into acidified water. An amorphous yellow or orange-brown 

 powder, with a bitter taste. Insoluble in water, soluble in alcohol, and in 

 ammonia solution. 



x Tinctura Podophylli. Dose, 5-15 min.; 0.3-1 c.c. 

 3.65; Alcohol to 100: by maceration. 



POTASSIUM. POTASSIUM. 



The incompatibles of the salts of potassium do not depend upon the 



84 



