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German composition

Section 71. ON PERFUMERY. II.

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The common or fixed⁠[1] oils, on the contrary, such as olive⁠[2] or linseed-oil, do not evaporate. This⁠[3] may be easily illustrated, thus: If a piece of writing-paper be touched⁠[4] with a fixed oil or grease, (S. 27, N. 8) it leaves⁠[5] a stain, which⁠[6], upon being held before the fire, will not disappear.

Now⁠[7], if any⁠[8] plant has a peculiar smell or taste, it is⁠[4] generally found that its essential oil is the cause of this (S. 4, N. 5, B). Consequently⁠[9], if we extract this, we really obtain⁠[10] the essence.—Prof. Ascher.

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