The pocket formulary, and synopsis of the British & foreign pharmacopœias : comprising standard and approved formulæ for the preparations & compounds employed in medical practice / by Henry Beasley.

  • Beasley, Henry
Date:
1851
Catalogue details

Licence: Public Domain Mark

Credit: The pocket formulary, and synopsis of the British & foreign pharmacopœias : comprising standard and approved formulæ for the preparations & compounds employed in medical practice / by Henry Beasley. Source: Wellcome Collection.

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    cinal Hydrocyanic or Prussic Acid. Mix f3vij of sul- phuric acid with fziv of distilled water, and when cool put them into a retort, and add f%ij of ferrocyanide of potassium dissolved in Oss of distilled water. Pour f3viij of distilled water into a receiver which is to be kept cold: then the retort being fitted to it, let f5vj be distilled over by the gentle heat of a sand-bath. Lastly, add to the pro- duct fzvj of distilled water; or so much that 12°59 gr. of nitrate of silver dissolved in water will accurately saturate 100 grs. of the acid. 100 grs. of this acid con- tain 2 grs. of hydrocyanic acid. Dose, 2 to 5 minims, E. Acidum Hydrocyanicum. Dissolve 3iij of ferro- cyanide of potassium in f%xj of water, and put the solution into a mattrass with a little sand, add f%ij of sulphuric acid previously diluted with f%v of water and allowed to cool; connect the matrass with a proper refrigeratory ; distil with a gentle head, by means of a sand-bath or naked gas-flame, till %xiv pass over, or till the residuum begins to froth up. It contains about 1 gr. of the real acid with 30 of water. Dose, lto3 minims. D. Acidum Hydrocyanicum Dilutum. Dissolve 3ij of ferrocyanide of potassium in f%viij of water; mix also f3j of oil of vitriol with f%iv of water. When cold introduce them suc- cessively into. a retort or matrass containing several slips of platina foil, and connected with a Liebig’s condenser ; and with the aid of a gentle heat let Zviij be distilled over. Finally, dilute the product with f3Zviij of distilled water, or so that the volume of the diluted acid shall be fsxvj. [It is to be regretted that no other criterion of -its strength is given than the sp. gr. which is ‘997. Dr. Neligan states that its strength is that of Ac. Hydrocy. dil. Li, But Mr. Abraham found the process to yield an - acid of greater but variable strength. See Hydrocyanic Acid in Appendix ITI.] Acipum Hyprocyanicum Scuxrstit. The original process of Scheele does not yield an acid of uniform strength, and is probably never followed. Itis therefore impossible to state precisely what is intended when Scheele’s acid is prescribed, or to discover the ground on which it is pre- ferred by certain physicians to the preparation of the
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