Dr. Pereira's Elements of materia medica and therapeutics : abridged and adapted for the use of medical and pharmaceutical practitioners and students and comprising all the medicines of the British Pharmacopœia, with such others as are frequently ordered in prescriptions or required by the physician / edited by Robert Bentley and Theophilus Redwood ; with an appendix.

  • Jonathan Pereira
Date:
1874
Catalogue details

Licence: Public Domain Mark

Credit: Dr. Pereira's Elements of materia medica and therapeutics : abridged and adapted for the use of medical and pharmaceutical practitioners and students and comprising all the medicines of the British Pharmacopœia, with such others as are frequently ordered in prescriptions or required by the physician / edited by Robert Bentley and Theophilus Redwood ; with an appendix. Source: Wellcome Collection.

    1117/1180 (page 1085)
    [§ Syrupus Chloral. Syrwp of Chloral. Take of Hydrate of Chloral . . 80 grains. Distilled Water ... 4 fluid drachms. Simple Syrup ... a sufficiency. Dissolve the hydrate of chloral in the water, and add the syrup until the mixed product measures a fluid ounce. Dose.—J fluid- drachm to 2 fluid drachms.] [§ Extractum Glycyrrhizae Liquidum. Liquid Extract of Liquorice. Take of Liquorice Root, in coarse powder . . 1 pound. Distilled Water 4 pints. Macerate the liquorice root with two pints of the water for twelve hours, strain and press ; again macerate the pressed marc with the remainder of the water for six hours, strain and press. Mix the strained liquors, heat them to 212°, and strain through flannel; then evaporate by a water-bath until it has acquired, when cold, a specific gravity of 1*160; add to this one-eighth of its volume of rectified spirit; let the mixture stand for twelve hours, and filter. Lose.—1 fluid drachm.] This is a convenient form in which to prescribe or dispense ex- tract of liquorice when it is used, as it often is, to cover the taste of other medicines. The first part of the process by which it is directed to be produced is the same as that already given in the Pharmacopoeia for extract of liquorice. The suggestion to stop the evaporation at the point indicated, and then to add an eighth of its volume of spirit, originated with Mr. Squire, and the process has been tested by him and found to answer well. Mr. Umney says the specific gravity of the finished product, after the addition of the spirit, is 1*130, and according to him the root, extract, and fluid extract bear to each other the relations of 100, 26, 61; but this does not quite accord with Mr. Squire's statement, that one fluid drachm of the fluid extract is equal to half a drachm of the extract. The discrepancy in these statements, however, is probably due to a difference iu the consistency of the samples of extract used for comparison, which Mr. Umney represents as ■ solid extract.' [§ Hydrargyri Oxidum Flavum. Yellow Oxide of Mercury. HgO or HgO. Take of Perchloride of Mercury ... 4 ounces. Solution of Soda .... 2 pints. Distilled Water .... a sufficiency.