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

  • Jonathan Pereira
Date:
1872
Catalogue details

Licence: Public Domain Mark

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

    1091/1132 (page 1059)
    about 100°. Has no rancid odour; dissolves entirely in etber. Distilled water in which it has been boiled, when cooled and filtered, gives no precipitate with nitrate of silver, and is not rendered blue by the addition of solution of iodine.] In the liquid state it should be perfectly clear and transparent; but if it be inter- mixed with water it has a whitish or milky appearance. By ex- posure to the air, it acquires an unpleasant odour and acid properties. In this state it is said to be rancid. As stearine does not become rancid in the air, while oleine does, the rancidity of lard is referred to the latter constituent. But it has been found that the purer the oleine the less readily does this change occur; whence it is assumed that some foreign substance in the oleine is the primary cause of rancidity, either by undergoing decomposition or by acting on the oleine. Composition.—Fresh lard, according to Braconnot, contains 62 per cent, of oleine or elaine, and 38 of margarine and stearine. Physiological Effects and Uses.—Lard, like other animal fats, is nutritious, but very difficult of digestion. Its topical effects are demulcent and emollient. In medicine lard is principally employed as a basis for ointments. It has been used, by friction, as an emol- lient ; but the practice is now obsolete. Pharmaceutical Uses.—Prepared lard is an ingredient of fourteen of the thirty-four official ointments, and of cantharides plaster. [§ Adeps Benzoatus. Benzoated Lard. Take of Prepared Lard 1 pound. Benzoin, reduced to coarse powder . 160 grains. Melt the lard by the heat of a water-bath, add the benzoin, and, frequently stirring them together, continue the application of heat for two hours ; finally remove the residual benzoin by straining.] Pharmaceutical Uses.—Benzoated lard is an ingredient in all the suppositories, and four ointments. Pepsina. Pepsin. The digestive principle of the gastric juice of Mammalia; obtained chiefly from the mucous membrane of the stomach of the sheep or Pig- (Not official.) Preparation.—Pepsin can hardly be said to have been obtained in a state of purity. The best method of effecting its isolation at present known, is that described in the French Codex, which is as 3 y 2