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

  • William Whitla
Date:
1889
Catalogue details

Licence: Public Domain Mark

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

    112/656 (page 108)
    It will thus be noticed that there is no official weight between 1 grain and 1 ounce ; but the 3i. and 9i., which represented the ^ and part of the old Troy ounce, are still permitted to exist under protest. They are, when used in a prescription, to be taken as meaning 60 grs, and 20 grs. respectively, and not the ^ and -^-^ of the Avoirdupois ounce, which would be 54*68 iind 18'22 grains respectively. The French Gramme, = 15-432 grs. The following are the symbols and signs met with in pre- scription writing; they must not be confounded with the official symbols, which are simply the first two letters of the English words, as fl. oz., fl. drm., &c. Gr. = Granum, 1 grain = of a Troy ounce, or of an Avoirdupois ounce. 3. = Scrupulum, 1 scruple = 20 grains. 3. = Drachma, 1 dram = 60 grs. or 3 scruples or i of a fluid ounce, or 60 minims. J. = Uncia, 1 ounce = 1 Troy oz. (480 grs.) or 1 fluid oz. (480 minims), or 437-5 grains of water. M. = Minimum, 1 minim = P^rt of a fluid dram or the volume of -9115 grains of water. Gtt. = Gutta, 1 drop, erroneously supposed to represent 1 minim. O. Octarius, 1 pint, = 20 fluid ounces, or lbs. of water. C. Congius, 1 gallon, = 8 pints, or 10 lbs. of water. DOMESTIC MEASURES. A teaspoonful—Cochleare minimum = 1 fluid dram (3j.) A dessertspoonful—Cochleare medium = 2 fluid drs. (.m].; A wme-giassiui—vjyaLxiua viJuaxiUD — -2 The practice of measuring medicines in spoons is open to very serious objections, since seldom will two be found just alike in capacity; and the physician should make a rule of examining the spoon and ascertaining its dimensions before tS patient uses' it as a measure., The common '' kitchen^ SDOon which is generally made of iron and coated over witb tin'fluctuates less in size than the other domestic measures .