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and up to date. One chapter deals with the determination of the amount of alcohol in beer and wine. Altogether the book cannot be said to be particularly well adapted for use in this country, although it doubtless serves a useful purpose in its place of origin. Die Wasserstoffionen-Konzentration, Ihre Bedeutung f\l=u"\rdie Biologie und die Methoden Ihrer Messung. Von Professor Dr. Leonor Michaelis, Privatdozent an der Universit\l=a"\tBerlin. Paper. Price, 8 marks. Pp. 210, with 41doi:10.1001/jama.1914.02570230076047 fatcat:qzcu7tdjifbcplagkpwo7x2u2e