. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 1004 MENTHA MENTHA tin pipe immei'sed in tanlcs of cold water, or more fre- quently arranged in perpendicular tiers over whicli cold water runs, a boiler to furnish steam and a receiver or tin can with compartments in which the oil separates by gravity. The yield of oil varies from 10 to CO pounds per acre, ave
. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 1004 MENTHA MENTHA tin pipe immei'sed in tanlcs of cold water, or more fre- quently arranged in perpendicular tiers over whicli cold water runs, a boiler to furnish steam and a receiver or tin can with compartments in which the oil separates by gravity. The yield of oil varies from 10 to CO pounds per acre, averaging about 25 pounds for Black Mint, the variety now generally grown. Three kinds of pepper- mint are recognized : (1) American Mint, "State Mint" of New York {M, piperita}, long cultivated in this country and occasionally naturalized ; (2} Black Mint, or Black Blitcham (M. piprrifii, var. riihjdi'i^), a more productive variety introduced from Eingland about 1889, and (3) White Mint, or White Mitcham {M. pipe- rita, var. officinalis), less productive and too ten- der for profitable cultivation, but yielding a very superior grade of oil. Peppermint oil is used in confectionery, very extensively in medicines, and for the production of menthol, or more properly pipmenthol. Pipmenthol differs in physical pro- perties from menthol derived from Japanese Mint. Japanese Mint, M. aroensis, \aT. piperasoens, is cult, in northern Japan, chiefly on the island of Hondo ; not known in the wild state. It has been introduced experimentally in cult, in England and the United States, but has not been cult, commer- cially in these countries. Its oil is inferior in qual- ity to that of Mentha piperita, but it contains a higher percentage of crystallizable menthol, of which it was the original source and for the pro- duction of which it is largely used. It is propa- gated by rootstocks carefully transplanted and cul- tivated by hand-labor. Two crops, rarely three, are obtained in a seas
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