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Practical Agricultural Chemistry

1907; Nature Portfolio; Volume: 76; Issue: 1967 Linguagem: Inglês

10.1038/076246a0

1476-4687

Samuel James Mason Auld, D. R. Edwardes-Ker,

Hops Chemistry and Applications

IN his introduction the author tells us that his book is intended as a course of laboratory practice for the use of students in agricultural chemistry. How much time does he suppose such students can give to agricultural chemistry to allow them to deal with subjects like the valuation of hop tea and coffee, or the determination of hop resin and glycerin in beer? To what class of readers is a paragraph like the following of, use? “The Bitter Used. This is necessarily a tedious operation, and for full particulars the reader is referred to such books upon poisons as describe the processes of Dragendorff and others. The prepared and Concentrated beer is subjected to a series of extractions with petroleum ether, benzene, chloroform, and amyl alcohol, each of which is examined in turn.”