. Bulletin. 1901-13. Agriculture; Agriculture. 32 THE PRODUCTION OF VOLATILE OILS AND PERFUMERY PLANTS. To picture more clearly the results of the experiments and the changes observed in the oils, tabulations were made as follmvs: Table I.—Yield of oil anil changes observed in plant* at different stages of growth. PEPPERMINT (MENTHA PIPERITA i. ~tnge of growth. Before flowering (July 22 At flowering time (August 21).. After flowering September 25). Ester con- Yield of tent as oil. menthyl acetate. .20 .10 Per cent. Alcohol content as free men- thol. BERGAMOT M
. Bulletin. 1901-13. Agriculture; Agriculture. 32 THE PRODUCTION OF VOLATILE OILS AND PERFUMERY PLANTS. To picture more clearly the results of the experiments and the changes observed in the oils, tabulations were made as follmvs: Table I.—Yield of oil anil changes observed in plant* at different stages of growth. PEPPERMINT (MENTHA PIPERITA i. ~tnge of growth. Before flowering (July 22 At flowering time (August 21).. After flowering September 25). Ester con- Yield of tent as oil. menthyl acetate. .20 .10 Per cent. Alcohol content as free men- thol. BERGAMOT MINT (MENTHA CITRATA). e of growth. Ester con- Yleld of tent as oil. linalyl acetate. Before flowering (July 20) At flowering time(September22;. After flowering (October 14). Alcohol content as linalool, free. WORMWOOD (ARTEMISIA ABSINTHIUM). Stag'' of grow th. Ester con- Yield of tent as oil. thujyl acetate. Alcohol content as thujyl alcohol, free. Before flowering (July 2).. At flowering time (July 141 After flowering (Au .18 .10 l'i r '•' nt. 32. 5 Per cent. It is obvious from these results that in two cases, with peppermint and with wormwood, the aromatic quality of the oil, if measured by the percentage of ester-, is increased gradually during each stage of growth, the percentage of hv' alcohol remaining fairly constant. In the peppermint the oil from the "after-flowering" stage was notice- ably more fragrant than the oils from the two earlier stages. The yield of oil remains fairly constant up to the last stage, when there is a marked diminution. The plant in the first two stages is very much the same as regards moisture content, while the low percentage of oil from the plant after flowering, when it possesses much less succulency, may be attributed to the consumption of other constitu- ent- than the esters and alcohol. This applies to all of the plants which seem to follow the same general course in this respect. The oils from t
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