The Chemistry of the C el Tar Colours. Translated from
the German of Dr. R. Benedekt, and edited by E. Knecht, Ph.D. (George Bell and Sons ) —This is rather a chemistry than a techno- legical guide for the ordinary dyer. The preparation and manufac- ture of the various dyes, their value, the action of alkalies and acids upon them, as well as the spectrum of some, and the formulas of all the reactions, are given in full. Mention is made of the use of aniline to colour wine, and the method of its detection. Tests for most of the dyes are also given, and mention is made of dyes some of which a warm summer's day is sufficient to eva- porate; others, like fluorescence, whose remarkable properties have assisted in determining the course of an underground river. This little manual forms, therefore, a convenient reference for dyeing chemists, and is all the more convenient for being condensed.
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