APOTHECARIES OR TROY WEIGHT.
| 20 | Grains (Granum) | (Gr. or Grs.) = 1 Scruple. |
| 3 | Scruples (Scrupulum) | (Sc.) = 1 Drachm (60 Grs.) |
| 8 | Drachms (Drachma) | (ʒ) = 1 Ounce. |
| 12 | Ounces (Uncia) | (℥) = 1 Pound (℔) |
In prescription writing the pound sign should not be used; always express large quantities by ounces.
APOTHECARIES’ LIQUID MEASURE.
| 60 | Minims (Minimum) | (M. or Ms.) = 1 Fluid Drachm. |
| 8 | Fluid Drachms (Fluid Drachma) | (fl. ʒ) = 1 Fluid Ounce. |
| 16 | Fluid Ounces (Fluid Uncia) | (fl. ℥) = 1 Pint. |
| 2 | Pints (Octarius) | (O.) = 1 Quart. |
| 4 | Quarts or 8 Pints = 1 Gallon | (congius—C.) |
In prescribing liquids the abbreviation for Quarts (Qts.) is never used. If a quart is desired it is expressed as two pints (Oij).
APPROPRIATE EQUIVALENTS OF WINE UNITS IN DOMESTIC MEASURES.
| Teaspoon | = ʒi. |
| Dessert spoon | = ʒii. |
| Table spoon | = ℥ss. |
| Cup | = ℥iv. |
| Tumbler | = ℥viii. |
TABLES FOR REGULATING THE DOSES FOR YOUNG ANIMALS
HORSES.