. Bulletin. Forests and forestry -- United States. 38 Even had the tubes retained equal quantities of turpentine oil, this method would still have the objection that one of the constituents Avas to be determined by ditt'erence—an objection esi)ecially serious when the ingredient to be so determined is small in comparison witli the materials to be weighed. The writer has therefore attempted to make use of a somewhat different principle. A few trials were sufficient to show that the method x^omised to give satisfactory results. Tlie basis of the method is the same which serves for the production
. Bulletin. Forests and forestry -- United States. 38 Even had the tubes retained equal quantities of turpentine oil, this method would still have the objection that one of the constituents Avas to be determined by ditt'erence—an objection esi)ecially serious when the ingredient to be so determined is small in comparison witli the materials to be weighed. The writer has therefore attempted to make use of a somewhat different principle. A few trials were sufficient to show that the method x^omised to give satisfactory results. Tlie basis of the method is the same which serves for the production of Eussian turpentine oil on a large scale, namely, the distillation of the volatile products from the wood itself, without previously obtaining the turpentine. But instead of condensing the volatile products, their vapors are passed over heated copper oxide whereby they are burned to water and <;arbou dioxide. Many trials were made with this method upon pure materials and on samples of resinoiis wood; as the results were found to be entirely concordant and satisfactory, the method was adopted, and by it were obtained the results presented in this report. DESCRIPTION OF THE METHOD EMPLOYED. A weighed amount of wood shavings is placed in a straigiit OaOU tube a. The tube is con- nected on one side by means of a ca])illary tube with a drier A, which serves for freeing the air from moisture and Tiie other end of the tube is connected with an ordinary combustion tube h containing granulated GuO. The tube is drawn out at one end as is shown in the figure, and the narrow portion is loosely filled with asbestos wool. The connection is made glass to glass, so that. Fig. 18.—Method of distillutiuu uf liuiifutiue. the vapors of distillation do not come in contact with any rubber tubing. The forward end of the combustion tube is connected with a OaCla tube c, (me-half of which is filled with granulated CaCU and the second half with P2O5. Then follows a potash bulb d provided
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