280 



JOURNAL OF FORESTRY 

 Table 6. 



" 10 per cent alcoholic solution. 



"Salt solution method (Forest Service Bulletin No. 119). 



This material had a slightly dark amber color and, after standing 

 for more than a year, still remained plastic, except for a very thin 

 superficial film, which became somewhat hardened. All attempts to 

 obtain a crystalline product from it failed. 



The average values obtained by various investigators on larch 

 turpentine and those obtained in the present investigation of material 

 from western larch are given in Table 7. There are also included in 

 the table the values obtained by Schorger ^" for Douglas fir turpentine, 

 which has been called "an excellent substitute'' for Venice turpentine 

 by a commercial firm to whom samples were sent by the Laboratory. 



Table 7. 



"■ K. Dieterich, "Analysis of Resins, Balsams, and Gum-Resins" (1901) p. 256. 



"Tschirch, "Die Harze und die Harzbehalter" (1906), p. 616. 



"" hoc. cit. Product from tree grown in Wisconsin. 



" New^ York importing firm. 



* Journal of the American Chemical Society, vol. 39 (1917). p. 1040. 



■Journal of the American Chemical Society, vol. 39 (1917), p. 1040. 



