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.

    1108/1180 (page 1076)
    Commercial gutta-percha, which is of a brown or chocolate colour, readily dissolves in chloroform, with the exception of a dark- coloured substance which floats on the surface of the solution, the latter being of a light brown or amber colour. On the addition of the carbonate of lead the insoluble matter forms with it a precipi- tate, which quickly subsides, leaving the solution clear, and this can now be removed by decantation. The carbonate of lead thus acts mechanically as a clarifying agent, and it answers this purpose very well. The process is essentially that of the United States Pharmacopoeia. [§ Charta Sinapis. Mustard Paper. Take of Black Mustard seeds, in powder 1 ounce Solution of Gutta-percha . 2 fluid ounces, or a sufficiency. Mix the mustard with the gutta-percha solution so as to form a semifluid mixture, and having poured this into a shallow flat- bottomed vessel, such as a dinner-plate, pass strips of cartridge- paper over its surface so that one side of the paper shall receive a thin coating of the mixture. Then lay the paper on a table with the coated side upwards, and let it remain exposed to the air until the coating has hardened. Before being applied to the skin, let the mustard paper be im- mersed for a few seconds in tepid water.] This paper, which has been also introduced into the last United States Pharmacopoeia, is an imitation of Kigollot's mustard leaves, which have been for some years in extensive demand as a ready, simple, cleanly, and safe rubefacient.