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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1804 Excerpt: ...an essential salt developed and crystallizable. Poultier le la Salle enlarges a. good deal on the distillation of ethereous oil of turpentine and balsam of turpentine, in the learned observations with which he has enriched the Translation of the Pharmacopoeia landinensis. He admits there an acid phlegm, a I did not extend any further my researches on the nature of this salt, the acid of which appears to me to approach very near to the nature of the benzoic acid; but, in the mean time, it may be denned an oily, acid salt, analogous to that extracted from balsams. The volatile salt of amber, perhaps, might be traced back to a similar origin; and if its chemical properties seem to be different, this may be ascribed to the influence of the mineral vapours, which for so many ages have been exercising an action on the resinous matter which constitutes amber. These vapours must necessarily have changed its principles, or brought them gradually to that point of modification which removes amber so far from the nature of our common resins, and even from that of copal, which seems to approach it most, as I have since shown. I was perfectly sensible that it would be of great importance to carry to a greater extent these researches on an object so nearly connected with the natural history of fossil resins. I might have attempted a greater number of experiments to discover the peculiar nature in the distillation of resins and balsams j but he makes no mention of a volatile, acid essential salt. If this concrete salt had been observed, that valuable repository of the Stahlean chemistry would have noticed its existence. When essence is distilled with a sand bath, if the retort he covered with a dome of hakcl clay to facilitate the expulsion of the vapours which circulate a...
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Book Description RareBooksClub.com, 2012. Paperback. Condition: New. Seller Inventory # LS68-newpainter