ABNEY.—A TREATISE ON PHOTOGRAPHY. By Sir William de Wiveleslie Abney, K.C.B., F.R.S., Principal Assistant Secretary of the Secondary Department of the Board of Education. With 115 Woodcuts. Fcp. 8vo., 3s. 6d.

GLAZEBROOK.—PHYSICAL OPTICS. By R. T. Glazebrook, M.A., F.R.S., Principal of University College, Liverpool. With 183 Woodcuts of Apparatus, etc. Fcp. 8vo., 6s.

WRIGHT.—OPTICAL PROJECTION: a Treatise on the Use of the Lantern in Exhibition and Scientific Demonstration. By Lewis Wright, Author of 'Light: a Course of Experimental Optics'. With 232 Illustrations. Crown 8vo., 6s.