Further observations on the internal use of the hydro-cyanic (prussic) acid, in pulmonary complaints; chronic catarrhs; spasmodic coughs; asthma; hooping-cough; and some other diseases : with full directions for the preparation and administration of that medicine / by A.B. Granville.
- Augustus Granville
- Date:
- 1819
Licence: Public Domain Mark
Credit: Further observations on the internal use of the hydro-cyanic (prussic) acid, in pulmonary complaints; chronic catarrhs; spasmodic coughs; asthma; hooping-cough; and some other diseases : with full directions for the preparation and administration of that medicine / by A.B. Granville. Source: Wellcome Collection.
Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.
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![[7] nuteness, as it is of the utmost importance to be very precise, as well as cautious, in the manipulation of this powerful agent. Scheele's Process. To two ounces of Prussian blue, mixed with one ounce of red precipitate of mercury, six ounces of water are added, and the whole boiled for some minutes with constant agitation; when the blue colour entirely disappears, and the mass becomes of a yellowish grey; it is then filtered, and the mass on the filter washed with a little hot water, which is added to the filtered liquor. Pour this upon one ounce and a half of clean iron-filings, and add three drachms of strong sulphuric acid. Shake the mixture well, and after allowing it to sub- side, pour off the liquor, put it into a retort, and distil the fourth part of it over into a well luted receiver, which will afterwards be found to contain the aqueous prussic acid, with an admixture of a little sulphuric acid, to be got rid of by means of barytic water. The improvement suggested by La Planche con- sists in limiting the first distillation to f of the whole, and in rectifying the liquid thus ob- tained, by means of a gentle fire, over -5-5^ of](https://iiif.wellcomecollection.org/image/b21055014_0019.jp2/full/800%2C/0/default.jpg)
