Identifier: americanjourna911919phil (find matches)
Title: American journal of pharmacy
Year: 1835 (1830s)
Authors: Philadelphia College of Pharmacy Philadelphia College of Pharmacy and Science
Subjects: Pharmacy Pharmacology
Publisher: Philadelphia : Philadelphia College of Pharmacy
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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as there has been little, if any, export trade in thisarticle since the beginning of the war. The domestic consumptionis on the increase and this is due apparently to a greater use of thismaterial, particularly by the varnish trade. Oregon fir balsam isalso being used to some extent as a substitute for Venice turpentine,a purpose for which, under the name of Douglas fir turpentine, itwas suggested by the Forest Products Laboratory about two yearsago. As such it is employed particularly in the ceramics industryand in the manufacture of porous plasters. In addition to these uses, it is probably employed to some extentalso in the place of Canada balsam. The term balsam, however,as applied to both of these articles, is a misnomer, since they arenot balsams but turpentines. Oregon fir balsam has been regarded 4 Duhamel, Traite des Arbres, II, page 355. 5 Tschirch, Die Harze und die Harzbehalter (1906), page 614. 6 G. Planchon et E. Collin, Les Drogues simples dorigine Vegetable, 1,page 70.
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View of larch tree tapped for Oleoresin according to the European method. Am. Jour. Pharm.June, 1919. Pharmacy of Tethelin. 349 with suspicion as a substitute for Canada balsam, especially sincethe publication of an article by Dowzard7 purporting to show thatOregan balsam is a fictitious articlemade by dissolving colophonyin turpentine. He regards the acid number of the resin (non-volatile residue) as indicating that Oregon balsam contains colo-phony, since the two values are: Oregon fir balsam resin 153 Colophony 155 More recent work by Rabak5 on commercial samples and ofSchorger9 on authentic samples of Oregon fir balsam show the acidvalues of the resins (non-volatile residues) to be practically thesame. The former obtained an average value of 153 (calculatedbasis of 70 per cent, resin) and the latter of 166 (calculated). Itfollows., therefore, that a high acid value for the resin does not showOregon fir balsam to be a spurious product as assumed by Dowzard.On the other hand, it app

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