Experiments and observations on a new species of bark, showing its great efficacy in very small doses : also a comparative view of the powers of the red and quilled bark ; being an attempt towards a general analysis and compendious history of the valuable genus of cinehona, or the Peruvian bark.

  • Kentish, Richard.
Date:
1784
Catalogue details

Licence: Public Domain Mark

Credit: Experiments and observations on a new species of bark, showing its great efficacy in very small doses : also a comparative view of the powers of the red and quilled bark ; being an attempt towards a general analysis and compendious history of the valuable genus of cinehona, or the Peruvian bark. Source: Wellcome Collection.

Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.

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    [ *2 ] carefully mixed together, and evaporated to a proper confiftence; fo that we have in this preparation all the virtues of the Peruvian bark that can be extracted by water or fpirit. Dr. Lewis feems to have been well acquainted with this fact, though he miftook the nature of the principles of the bark. “In the bark,” fays he, <c we may diftinguifh two kinds of “ taltes, an ajlringent and a bitter one; the “ former of which feems to refide in the “ ref nous matter ^ and the latter chiefly in the “ gummy. The watery extradt is moderately “ ftrong in point of bitternefs, but of the “ aftringency it has only a fmall degree. “ The pure refin, on the other hand, is “ ftrong in aflringency, and weak in bitter- “ nefs. Both qualities are united in the “ prefent (Edin.) extra dt, which appears to “ be the belt preparation of this kind that “ can be obtained from this valuable drug.” Lewis’s Difp. p. 413. We entirely agree with the author in his fentiments of the Edinburgh extract, but have already pointed out his miftake of the nature of the bark; which is indeed furpriflng, confidering the general accuracy of his obfer- vations. Tindtures
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