AN INTRODUCTION TO THE THEORY OF OPTICS. By Professor Arthur Schuster, Ph.D., F.R.S., Professor of Physics at the University of Manchester. With numerous Diagrams. Demy 8vo., 15s. net.

ASTRONOMICAL DISCOVERY. By H. H. Turner, Savilian Professor of Astronomy in the University of Oxford. With Diagrams. Demy 8vo., 10s. 6d. net.

VECTORS AND ROTORS. With Applications. Being Lectures delivered at the Central Technical College By Professor O. Henrici, F.R.S. Edited by G. C. Turner, Goldsmith Institute. Crown 8vo., cloth. 4s. 6d.

THE PRINCIPLES OF MECHANISM. By H. A. Garratt, A.M.I.C.E., Head of the Engineering Department of the Northern Polytechnic Institute, Holloway. Crown 8vo., cloth, 3s. 6d.

ELEMENTARY PLANE AND SOLID MENSURATION. By R. W. K. Edwards, M.A., Lecturer on Mathematics at King’s College, London. For use in Schools, Colleges, and Technical Classes. 304 pages, Crown 8vo., 3s. 6d.

FIVE-FIGURE TABLES OF MATHEMATICAL FUNCTIONS. By J. B. Dale, M.A. Camb., B.A. Lond., late Scholar St. John’s College, Cambridge, Lecturer on Pure and Applied Mathematics, King’s College, University of London. Demy 8vo., 3s. 6d. net.

AN ELEMENTARY TREATISE ON PRACTICAL MATHEMATICS. By John Graham, B.A., Demonstrator of Mechanical Engineering and Applied Mathematics in the Technical College, Finsbury. Crown 8vo., cloth, 3s. 6d.

PRELIMINARY PRACTICAL MATHEMATICS. BY S. G. Starling, A.R.C.Sc., B.Sc., Head of the Mathematics and Physics Department of the West Ham Municipal Technical Institute; and F. C. Clarke, A.R.C.Sc., B.Sc.

THE EVOLUTION THEORY. By August Weismann, Professor of Zoology in the University of Freiburg-im-Breisgau. Translated by Professor J. Arthur Thomson. With numerous Illustrations and Coloured Plates. Two Vols. Royal 8vo., 32s. net.
The importance of this work is twofold. In the first place, it sums up the teaching of one of Darwin’s greatest successors, who has been for many years a leader in biological progress. As Professor Weismann has from time to time during the last quarter of a century frankly altered some of his positions, this deliberate summing up of his mature conclusions is very valuable. In the second place, as the volumes discuss all the chief problems of organic evolution, they form a reliable guide to the whole subject, and may be regarded as furnishing—what is much needed—a Text-book of Evolution Theory.

ANIMAL BEHAVIOUR. By C. Lloyd Morgan, LL.D., F.R.S., Principal of University College Bristol, author of ‘Animal Life and Intelligence,’ etc. With numerous Illustrations. Large crown 8vo., 10s. 6d.