TINCTURA. MAGMyE. 77 



Group F: 20% Tinctures of limited or doubtful utility: Arnicae, Asafcetidx, 

 Benzoini, Calumbse, Cinchonae, Guaiaci, Guaiaci Ammoniata, Lactucarii (50%), Py- 

 rethri, Quassias, Rhei. 



RESINA. 



Resins are precipitates from strong alcoholic extracts of water-insoluble prin- 

 ciples. They usually contain the major portion of the active principles of the drug. 



Prepare the official Resina Podophylli as follows : Moisten 200 Gm. podophyllum, 

 No. 60 powder, with 100 mils alcohol; pack it in a percolator; saturate the powder with 

 alcohol so as to leave a stratum above. Cover percolator, and macerate the powder 

 lor 48 hours. Then proceed with the percolation, gradually adding alcohol until a 

 sample of the percolate gives no more than a slight turbidity with water. Reduce the 

 percolate to a thin syrupy consistency by distilling off the alcohol ; then, with constant 

 stirring, pour the syrupy extract into 200 mils distilled water which has been acidu- 

 lated with 2 mils HC1, and then reduced to a temperature below 10 C. After sub- 

 sidence is complete, decant the supernatant liquid, and wash the precipitate twice, by 

 decantation, using fresh portions each time of 200 mils cold water. Dry the precipitate 

 by spreading it in a thin layer on a strainer, and exposing it to the air in a cool place, 

 protected from the light. If aggregated, when dry, pulverize in a mortar. 



Note : Appearance 

 Color .. 



Odor 



Taste 



Dose, o.oi Gm. Take such a dose; report results:. 



The two other official Resins are : 



Resina Jalapae. Dose, 0.125 Gm. Used in compound cathartic pill. 

 Resina Scammoniae. Dose, 0.2 Gm. Used in compound colocynth extract. 

 These three resins have marked purgative properties. 



MAGMYE. 



Magmas are thick, bulky suspensions in water of insoluble substances. 



Prepare the official Magma Magnesia? ("Milk of Magnesia") as follows: 

 Smoothly mix 12.5 Gm. magnesium carbonate (in fine powder) with 50 mils distilled 

 water. To this, with constant stirring, add a solution of 8 Gm. sodium hydroxide in 

 40 mils distilled water; agitate the mixture frequently for 15 minutes. Using 200 

 mils distilled water each time, wash the Magma by decantation, until i drop dil. 

 H 2 SC>4 will discharge the color of 3 drops phenolthalein T. S. when added to a 5O-mil 

 sample of the washing. Allow the precipitate to subside until it measures 100 mils; 

 then decant the supernatant liquid, bottle, and tightly stopper. 



Note : Appearance Odor 



Color 



Taste 



A small amount of any flavoring oil may be added if desired. 

 Milk of magnesia is sometimes used as an antacid. Dose, 10 mils. 



