The pharmacopoeia of the King and Queen's College of Physicians in Ireland. MDCCCL.

Date:
1850
Catalogue details

Licence: Public Domain Mark

Credit: The pharmacopoeia of the King and Queen's College of Physicians in Ireland. MDCCCL. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    decanted liquors be evaporated to the bulk of one quart, and filtered through calico when cold, and to the solution thus obtained add the lime, until the mixture becomes decidedly alkaline. The precipi- tate, collected on a calico filter, is to be washed with about a pint of cold water, and, when partially dried on porous bricks, to be enveloped in blotting-paper and subjected to powerful pressure. The pressed mass must now be introduced into a flask containing a pint of the spirit, which is to be raised to and maintained at the temperature of ebullition for twenty minutes, and then, after the subsidence of the insoluble mat- ter, decanted. This process having been repeated successively with the second and third pints of spirit, and the undissolved residuum having been subjected to expression, let the decanted and expressed liquors be cleared by passing them through a paper filter, and then subjected to distillation, so as to recover the entire of the spirit. The brown viscid mass which remains is now to be mixed with sixteen ounces of water, and, this being raised to the boiling point, the dilute sulphuric acid must be added, so as to produce a neutral or very slightly acid solu- tion. Add now the animal charcoal, boil for five minutes, filter, and set to cool, in order that crystals may be formed, which are to be dried on blotting- paper by mere exposure to the atmosphere. The liquor decanted from the crystals will, by further concentration and cooling, yield an additional pro- duct.