. Bulletin of the Department of Agriculture. Agriculture; Agriculture. DISTILLATION OF STTTMPWOOD. 63 dicating that the pinene present is laevo-alpha-pinene. Subsequent fractions showed dextro-rotations, in a continually advancing degree. The extra high density of the first distillate to come over is to be attributed to the presence of traces of water, held in solution by small quantities of methyl alcohol, known to occur in this portion of refined turpentine recovered from crude second turpentine, and also partly to the presence of the alpha-pinene. As the distillation pro-. £>0 0O S0
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. DISTILLATION OF STTTMPWOOD. 63 dicating that the pinene present is laevo-alpha-pinene. Subsequent fractions showed dextro-rotations, in a continually advancing degree. The extra high density of the first distillate to come over is to be attributed to the presence of traces of water, held in solution by small quantities of methyl alcohol, known to occur in this portion of refined turpentine recovered from crude second turpentine, and also partly to the presence of the alpha-pinene. As the distillation pro-. £>0 0O S00 &0 40 GO OO 70 /?£/? CfS/7- 0/&T/LL££? Fig. 7.—Refractive index of distillate. gresses the specific gravity of the distillate slowly rises with the boil- ing point to where, at about 20 per cent of total distillate, the presence of a body having a specific gravity lower than that of the distillate immediately preceding it again asserts itself by a bending back- ward of the specific-gravity curve at this point. This may be due to the presence of one or more of several bodies, the most probable of which is limonene or dipentene (specific gravity , refractive. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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