An analysis of the medicinal waters of Llandrindod, in Radnorshire, South Wales : with observations upon the diseases to which they are applicable, and directions for their use. To which is prefixed a topographical account of the place / by Richard Williams.

  • Williams, Richard, active 1817.
Date:
1817
Catalogue details

Licence: Public Domain Mark

Credit: An analysis of the medicinal waters of Llandrindod, in Radnorshire, South Wales : with observations upon the diseases to which they are applicable, and directions for their use. To which is prefixed a topographical account of the place / by Richard Williams. Source: Wellcome Collection.

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    LLANPAWR ROCK. This rock lies about half a mile north of the sulphureous water; its specific gravity is 2.29. The stone is exceedingly hard, but may be reduced to powder by making it red hot, and then suddenly plunging it into cold water, it breaks with a smooth fracture, and exhibits a grey or bluish surface, in¬ terspersed with dark black spots, and effervesces strongly with the mineral acids, giving out nearly 5 per cent, of carbonic acid gas. The colour of the rock depends on the iron ; and although rendered lighter by digestion in cold diluted muriatic acid, the dark spots cannot be extracted without the assistance of heat, when the silex is left perfectly white. 50 parts of the rock yielded by analysis, of Grams. Carbonate of lime.. 6.5 Iron and alumina . 8.25 Silex ... 35.25 Total...... 50 From the experiments which have been detailed, it is evident that the saline ingredients of the waters