Oxford). Demy 8vo. 16s. net. Mathematical Gazette. " It would be superfluous to commend this book to geometers, for they will have ordered it by the first post, but all mathematicians will find here a great deal of amusing and exciting reading-where else, for instance, will the algebraist see the geometric meaning of the Lagrange resolvent? School libraries should buy it, for it would be a real revelation to a gifted sixthformer, and to many a mathematical master. The present reviewer owes

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... dy several hours of pure enjoyment to the authors and publishers." ADVANCED TRIGONOMETRY. By C. V. DURELL, M.A-., and A. ROBSON, M.A. 10th Edition, 10s. 6d. This book is a continuation of Durell and Wright's well-known Elementary Trigonometry (twenty-fourth edition, 6s.), and completes the school course for mathematical specialists.