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THIS second edition of Prof. Bohle's work is considerably revised and extended and is much more complete than his original treatise, which was based on lectures delivered at the University of Cape Town. The opening chapters follow the now familiar order, and are well adapted for the use of students. Chap. i. deals with photometric quantities, Chap. ii. with radiation and its effects. Subsequent chapters deal with the eye, photometric apparatus, the testing of electric lamps, shades, globes and reflectors, and illuminating engineering in general. The sections on photometric apparatus and the testing of electric lamps and illumination are exceptionally full.Electrical Photometry and Illumination: a Treatise on Light and its Distribution, Photometric Apparatus and Illuminating Engineering. Pp. xvi + 427. By Prof. Hermann Bohle. (London: Charles Griffin and Co., Ltd., 1925.) 25s. net.