TELEGRAPHY. By Sir W. H. Preece, K.C.B., F.R.S., M.I.C.E., and Sir J. Sivewright, M.A., K.C.M.G. With 267 Illustrations. Fcp. 8vo., 6s.

PHYSICAL OPTICS. By R. T. Glazebrook, M.A., F.R.S. With 183 Illustrations. Fcp. 8vo., 6s.

TECHNICAL ARITHMETIC AND MENSURATION. By Charles W. Merriefield, F.R.S. 3s. 6d. Key, by the Rev. John Hunter, M.A. Fcp. 8vo., 3s. 6d.

THE STUDY OF ROCKS. By Frank Rutley, F.G.S. With 6 Plates and 88 Illustrations Fcp. 8vo., 4s. 6d.

WORKSHOP APPLIANCES, including Descriptions of some of the Machine Tools used by Engineers. By C. P. B. Shelley, M.I.C.E. With 323 Illustrations. Fcp. 8vo., 5s.

ELEMENTS OF MACHINE DESIGN. By W. Cawthorne Unwin, F.R.S., B.Sc., M.I.C.E.

Part I. General Principles, Fastenings and Transmissive Machinery. With 304 Illustrations. 6s.

Part II. Chiefly on Engine Details. With 174 Illustrations. Fcp. 8vo., 4s. 6d.

STRUCTURAL AND PHYSIOLOGICAL BOTANY. By Otto Wilhelm Thomé, and A. W. Bennett, M.A., B. Sc., F.L.S. With 600 Illustrations. Fcp. 8vo., 6s.

PLANE AND SOLID GEOMETRY. By H. W. Watson, M.A. Fcp. 8vo. 3s. 6d.