An experimental inquiry into the chemical and medical properties of the statice limonium of Linnaeus / by Valentine Mott.

  • Mott, Valentine, 1785-1865.
Date:
1806
Catalogue details

Licence: Public Domain Mark

Credit: An experimental inquiry into the chemical and medical properties of the statice limonium of Linnaeus / by Valentine Mott. Source: Wellcome Collection.

Provider: This material has been provided by the National Library of Medicine (U.S.), through the Medical Heritage Library. The original may be consulted at the National Library of Medicine (U.S.)

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    it more of the chalybeate solution ;* but on examination was found to contain sulphuric acid, and a small quantity of iron. Nicholson, in his First Principles of Chemistry, says, The black fecula is not magnetical; but it is con- verted into a brown magnetic calx by heat. The precipitate formed by adding the vegetable and volatile alkalies to vegetable astringents, has by some been considered as the astringent principle. In Keir's Chemical Dictionary a number of observations may be seen relating to this principle. It is there said, when re- dissolved in water, it blackened a solution of iron but faintly: this is supposed was owing to a small quantity of acid remaining. Dr. Woodhouse supposes that a neu- tral salt exists ready formed in astringent vegetables, composed of a peculiar acid (gallic acid) and the earth of alum.-] That the astringent principle is in the state of a neu- tral salt, as Dr. Woodhouse argues, I cannot from the result of my experiments admit. In experiment twenty- third I have shown that the astringent principle was pre- cipitated, and that the supernatant liquor was found to contain sulphuric acid, and a very small quantity of iron, which would not have been the case if the theory ad- vanced by Woodhouse were correct; for the supernatant liquor agreeable to him must be a solution of sulphate of alumine, the gallate of iron being precipitated. That the * That the black precipitate may be reduced to iron, has, I think, been clearly proven by the experiments of Dr. Woodhouse, on astrin- gent vegetables. f Vide Inaugural Thesis, 6