53 



ture, not to exceed 50° C, stir constantly for 5 minutes, and then 

 continue to heat, stirring frequently, until the alcohol is expelled 

 and the mercuric oxide is dissolved, now add sufficient oleic acid to 

 make the product weigh 20.0 grams and mix thoroughly. Avoid 

 contact with metallic instruments; preserve the oleate in tightly 

 stoppered bottles. 



Remarks : — This is the only official oleate of the Pharmacopoeia. 

 The others were dropped at the last revision. 



Chapter X. 



INFUSA— INFUSIONS 



These are preparations of vegetable drugs made by maceration 

 or percolation. In the one official infusion, Infusum Digitalis,, and 

 the general formula for making infusions, the water is poured on 

 while boiling hot. Cold water should be used for those drugs whose 

 active principle would be driven off or its formation prevented by 

 boiling water. 



The following general formula is given for the preparation of 

 infusions : 



Infusum — Infusion 



The substance coarsely comminuted 50.0 Gm. 

 Water, a sufficient quantity 



to make 1000.0 mils 



Put the substance into a suitable vessel provided with a cover. 

 Pour upon it 1000 mils of boiling water, cover tightly and let steam 

 one-half hour in a warm place. Then strain with expression and 

 pass enough water through to make the infusion measure 1000 mils. 



Infusum Digitalis — Infusion of Digitalis 



Digitalis, bruised 1.5 Gm. 



Cinnamon Water 15.0 mils 



Water, a sufficient quantity 



to make 100.0 mils 



