47 



Rub the pure extract of glycyrrhiza and acacia in a mortar with 

 50 mils of warm water, until they are dissolved. Allow the solution 

 to cool. Transfer the solution to a graduated vessel, add the anti- 

 mony and potassium tartrate dissolved in 1.2 mils (18 drops) of hot 

 water, then the other ingredients and rinse the mortar with enough 

 water to make the product measure 100.0 mils. Mix the whole 

 thoroughly. 



MAGMA 



Magmae are aqueous preparations containing thick, tenaceous 

 precipitates. Two are official. Magma Bismuthi and Magma Mag- 

 nesiae. 



Magma Magnesiae — Magma of Magnesia, Milk of Magnesia. 

 Magnesia Magma yields not less than 6.5 per cent, nor more 

 than 7.5 per cent, of Mg(0H)2. 



Magnesium Carbonate, in fine powder 12.5 Gm. 



Sodium Hydroxide 8.0 Gm. 



Distilled Water, a sufficient quantity 



to make 100.0 mils. 



Mix the magnesium carbonate with enough distilled water 

 (about 50 mils) and make a smooth mixture. Dissolve the sodium 

 hydroxide in 40 mils of distilled water, add the solution to the mag- 

 nesia mixture with constant stirring, and agitate it frequently dur- 

 ing 15 minutes. Wash the resulting magma by decantation, using 

 200 mils of distilled water each time, until the red color produced 

 in 50 mils of the washings by 3 drops of phenolphthalein (T. S.) 

 is discharged by the addition of 1 drop of diluted sulphuric acid. 

 Then allow the precipitate to subside until it measures 100.0 mils, 

 decant the supernatant liquid, transfer the product to wide-mouthed 

 bottles, and tightly stopper with corks which have been dipped in 

 melted paraffin. 



Note : — The distilled water in this preparation may be re- 

 placed by water which has been heated to the boiling point with 

 powdered magnesium carbonate (5 Gm. in each 1000 mils) and 

 then filtered. One drop of oil of peppermint or a sufficient quantity 

 of oil of anise or other flavor may be added is desired. 



