Practical prescribing and dispensing for medical students / by William Kirby.

  • Kirby, William.
Date:
1904
Catalogue details

Licence: In copyright

Credit: Practical prescribing and dispensing for medical students / by William Kirby. Source: Wellcome Collection.

    17/188 (page 13)
    Cochleare amplum i Cochleare largum la tablespoonful =4 fluid drachms Cochleare magnum J Cyathus vinarius a wineglassful =2J fluid ounces Cyathus magnus a tumblerful = 8 to 10 fluid ounces Gutta, pi. ie a drop. 60 drops of distilled water equal about 1 fluid drachm, but of chloroform 250 drops are required to make up the same volume. The number of drops in a given volume varies according to the character of the liquid and of the vessel from which the dropping is done. The spoons of the household also, vary within wide limits. It is therefore necessary when prescribing medicines in even a moderately concentrated state that directions be given for the patient to be supplied with a measure graduated in teaspoons and tablespoons, or in minims. As a further safeguard it is advisable for the patient to know how many doses the bottle contains. A few pharmacists place the number of doses on a separate label. Exercises. Weigh—Twenty grains powdered rhubarb; one drachm sodium bicarbonate; one scruple extract of taraxacum. Before weighing, see the hand scales swing freely and evenly; let the pans rest on the counter and place the weight in the left-hand one; the substance is to be weighed in the right-hand pan, and the scales are to be suspended in the left hand; the pans are to be elevated above the counter only when the balancing observation is being made. Measure—Three fluid ounces peppermint water; fifteen minims tincture of opium; two and a half drachms aromatic spirit of ammonia.