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A NUMBER of books dealing with radio-activity and the kindred phenomena have already appeared; and it is a bold thing on the part of an author to place another before the public. However with the exception of Prof. Rutherford's inimitable treatise on the subject, none of the previous works have been characterised by any striking individuality, so that there is, or rather was, still room for a vigorous statement of the general features of the subject from a popular point of view. This the author of the present work has accomplished in a manner that leaves little room for criticism. He possesses to a remarkable degree the faculty of stating difficult questions in a simple way, and of expressing the answers in a language which is easily understood.The Becquerel Rays and the Properties of Radium.By the Hon. R. J. Strutt. Pp. vii + 214. (London: Edward Arnold, 1904.) Price 8s. 6d. net.