Elements of pharmacy, materia medica, and therapeutics / by William Whitla.

  • Whitla, William, 1851-1933.
Date:
1882
Catalogue details

Licence: Public Domain Mark

Credit: Elements of pharmacy, materia medica, and therapeutics / by William Whitla. Source: Wellcome Collection.

    21/544 (page 5)
    7.000 grains. These are the only weights that a student has to learn (unless that he is expected to have some idea of the metrical system). It will be seen that in this weight, which is called the Imperial Standard, or Avoirdupois weight, there is no dram or scruple, but in the preface to the Pharmacopoeia it is written that it will be optional with the physician in prescribing to use the symbols of the dram (g) and the scruple (9), the former representing 60 and the latter 20 grains. However, it is now becoming the custom to order solids by grains or ounces, and confine the use of the dram to the liquid measure of 60 minims, or the £th part of a fluid ounce. If, however, the dispenser meets with a dram or a scruple of a solid substance in a prescription, he is to put in 60 or 20 grains—(though strictly 54^ grs. and 18 grs. are respectively equivalent to the £ and ^ of an avoirdupois ounce). Fig. 2.