Wild volatile-oil plants and their economic importance . rystals were soft and flaky in nature andpossessed the characteristic odor of camphor. IDEXTIFICATIOX OF CAMPHOR. In order to identify the crystalline substance obtained from theoil, a small quantity was sublimed, and the usual tests of meltingpoint, boiling point, and rotation were applied. For further recog-nition of the compound, an attempt was made to prepare an the method of Auwers 1 was applied, which, briefly, is as l Auwers, K. Zur Darstellung der Oxime. Berichte der Deutschen Chemischen Gesellschaft,vol. 22,188
Wild volatile-oil plants and their economic importance . rystals were soft and flaky in nature andpossessed the characteristic odor of camphor. IDEXTIFICATIOX OF CAMPHOR. In order to identify the crystalline substance obtained from theoil, a small quantity was sublimed, and the usual tests of meltingpoint, boiling point, and rotation were applied. For further recog-nition of the compound, an attempt was made to prepare an the method of Auwers 1 was applied, which, briefly, is as l Auwers, K. Zur Darstellung der Oxime. Berichte der Deutschen Chemischen Gesellschaft,vol. 22,1889. pp. 16 WILD VOLATILE-OIL PLANTS. follows: To a solution of 10 parts of camphor in 10 to 20 times theamount of 90 per cent alcohol is added a solution of 7 to 10 parts ofhydroxylamine hydroehlorid and 12 to 17 parts of a soda turbidity results, more alcohol is added and the mixture is heatedon a water bath until a small portion of the solution remains clearupon the addition of water or until the resulting turbidity disappears,. Fig. 2.—Flowering top of a plant of black sage. when a few drops of soda solution are added and no free camphorremains. The mixture is then diluted with water, filtered if neces-sary, and neutralized with dilute hydrochloric acid. The camphoroxime which separates is recrystallized from alcohol or ligroin. Itmelts at 118° to 119° C. The above method applied to the sublimed crystals resulted inthe formation of an oxime which melted at 120° to 124° C. Since 235 BLACK SAGE. 17 an oxime was obtained (indicating possible ketonic characters;,application was made of another reaction for ketones, namely, theformation of semicarbazone. Tiemanns method1 for the prepara-tion of camphor semicarbazone was applied. The method is asfollows: grams of camphor dissolved in 2 cubic centimetersglacial acetic acid are treated with a solution of grams of semi-carbazid hydrochlorid and grams of sodium acetate in 2 cubiccentimeters of
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