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.

    75/1180 (page 43)
    tilled water, are added to 439 grains by weight (1 fluid ounce) of this preparation, the mixed solution acquires a deep red colour, which requires for its discharge 750 grain-measures of the volume- tric solution of hyposulphite of soda, corresponding to 2*66 grains of chlorine. Dose, 10 to 20 minims.] The tests prove, first, freedom from saline impurity; and, secondly, the quantity of chlorine present in solution, the chlorine replacing the iodine of the iodide of potassium, and the free iodine reacting upon the hyposulphite of soda to form iodide of sodium and tetrathio- nate of soda; thus, C12, + 2KI=2KC1 + I2; then 2(Ka2H2S204)+I2 =2NaI + ^a2S406 + 2H20. Therapeutics.—It has been used diluted with six volumes of water as a gargle in putrid sore throat, as a local bath in liver diseases, and as a deodorising application to cancerous and other ulcers attended with a fetid discharge; in the latter case I have repeatedly employed it with advantage, though I give the preference to the solution of chlorinated soda. Internally it has been administered in typhus, in scarlet fever, and in malignant sore throat. Antidote.—White of egg in milk, or even flour, chlorine forming, with albumen, caseine, or gluten, a harmless compound. Acidum Hydrochloricum. Hydrochloric Acid. History.—Watery hydrochloric acid was probably known to Geber, in the eighth century. The present mode of obtaining it was contrived by Glauber. Priestley, in 1774, first obtained gaseous hydrochloric acid. Scheele may be regarded as the first person who entertained a correct notion of the composition of this acid, and to Sir H. Davy we are principally indebted for the establishment of Scheele's opinion. The solution is commonly known as Spirit of Salt. [§ Acidum Hydrochloricum. Hydrochloric Acid. Synonym.—Acidum Muriaticum purum, Hd., Bub. Hydrochloric Acid gas, HC1 or HC1, dissolved in water, and forming 31*8 per cent, by weight of the solution. It may be prepared by the following process :— Take of Chloride of Sodium, dried „ . 48 ounces. Sulphuric Acid . . . .44 fluid ounces. Water ...... 36 fluid ounces. Distilled Water . . .50 fluid ounces. Pour the sulphuric acid slowly into thirty-two ounces of the water, and when the mixture has cooled add it to the chloride of sodium previously introduced into a flask having the capacity of at least one