176 DOSES AND THEIR EQUIVALENTS. 



PESSARIES 



Are similar in composition, but made in a suitable 

 shape to be used in female complaints, where it is 

 desirable to apply remedies to the walls of the internal 

 passages. 



CONCENTRATIONS 



Are a class of medicinal resins or resinoids obtained 

 from medicinal drugs by precipitation from their alco- 

 holic preparations, either by water, distillation, or other 

 suitable means. 



Those at present in use contain one or more, but not 

 always all the therapeutic virtues of the drugs from 

 which they are made, and in many cases are only 

 powdered extracts. 



Doses and their 

 Equivalents. 



1 drop is equal to ^ of a fluid drachm. 



1 grain ,, ^ of a solid drachm. 



1 drachm ,, £ of an ounce. 



1 tablespoonful ,, £ of an ounce. 



1 wineglassful ,, 1^-2 ounces or 3 to4tablespoonfuls. 



1 teacupful ,, 3-4 ounces or 6 to 8 tablespoonfuls. 



1 pint ,, £ of a gallon or 20 fluid ounces. 



1 quart ,, J of a gallon or 2 pints. 



1 gallon „ 4 quarts or 8 pints. 



