Science papers : chiefly pharmacological and botanical / by Daniel Hanbury; edited, with a memoir, by Joseph Ince.

  • Daniel Hanbury
Date:
1876
Catalogue details

Licence: Public Domain Mark

Credit: Science papers : chiefly pharmacological and botanical / by Daniel Hanbury; edited, with a memoir, by Joseph Ince. Source: Wellcome Collection.

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

    62/572 page 46
    1850. equal in intensity to that of the other sort. Almost the only difference that could be detected in these two samples (excepting the absence of indigo in one) was, that the residuum of No. 1, when coloured with an acid, was of a finer red than that of No. 2 similarly treated. This doubtless arose from the indigo in the latter partially obscuring the red colour. Various Accompanying these samples, which were from one of the ^Litmus °^ respectable litmus manufacturers at Amsterdam, our cor- respondent sent the price current of another maker, which I inclose for thy inspection. It offers no fewer than twenty- three different qualities of litmus, the cheapest of which is but a ninth part of the value of the most expensive. We were however informed (as we might indeed have easily supposed) that several of the lower qualities of this manufacturer were far from genuine. I remain, very respectfully thine, Daniel Hanbury. [The price current referred to was that of Jan Dekker, of Wormerveer, in Holland.] ON THE llESIN OF THE NORWAY SPRUCE FIR. (Abies excelsa.) In the Materia Medica of the London Pharmacopoeia two forms of the resin of the Norway Spruce Fir (Ahies excelsa) are enumerated: one, Ahietis resina, called Common Thus or Frankincense; the other, Pix ahietina, or Burgundy pitch. The latter is stated to be the resin in a prepared state (Resina prcp.pa7'ata); the preparation essentially consisting in the removal of the impurities by straining. Abietis The first of these substances, viz., Ahietis resina, is rare in resina. j^^giigji commerce, and it was not until during a recent visit to Switzerland that I had an opportunity of obtaining an authentic specimen. In many parts of that country this species of Ahies is very abundant, forming extensive and beautiful tracts of forest. The resin exudes spontaneously from fissures in the bark of the tree, and especially from those places where branches have been broken oft\ When it first issues, it is
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