12 Scientific Works published by Longmans, Green, & Co. 

TRIGONOMETRY. 
CASE Y.—A TREATISE ON ELEMENTARY :TRIGONO- 
METRY. By JoHN Casey, LL.D., F.R.S., late Fellow of the Royal University 
of Ireland. With numerous Examples and Questions for Examination. remo., 
35. 
CLARKE.—PLANE TRIGONOMETRY. Containing the more 
advanced Propositions, Solution of Problems and a complete Summary of For- 
mulze, Bookwork, etc., together with recent Examination Papers for the Army, 
Woolwich, etc. With Answers. By the Rev. A. DAWSON CLARKE, M.A., St. 
John’s College, Cambridge. Crown 8vo., 55. 
GOODWTIN.—Works by H. B. GOODWIN, M.A. 
PLANE AND SPHERICAL TRIGONOMETRY. In Three 
Parts, comprising those portions of the subjects, theoretical and practical, 
which are required in the Final Examination for Rank of Lieutenant jat 
Greenwich. §8vo., 8s. 6d. 
ELEMENTARY PLANE TRIGONOMETRY. With numerous 
Examples and Examination Papers set at the Royal Naval College in recent 
years. With Answers. 8vo., 5s. 
JONES.—THE BEGINNINGS OF TRIGONOMETRY. _ By 
A. CLEMENT JONES, M.A., Ph.D., late Open Scholar and Senior Hulme 
Exhibitioner of Brasenose College, Oxford; Senior Mathematical Master of 
Bradford Grammar School. Crown 8vo., 2s. 
MURRAY.—PLANE TRIGONOMETRY FOR COLLEGES 
AND SECONDARY SCHOOLS. By DANiEL A. Murray, B.A., Ph.D., 
Instructor in Mathematics in Cornell University. Crown 8vo., 3s. 6d. With 
Logarithmic and Trigonometric Tables. Crown 8vo., ss. 
SMITH.—ELEMENTARY TRIGONOMETRY. By J. HAMBLIN 
Sm1TH, M.A. Crown 8vo., 45. 6d. Key, 7s. 6d. 
OPTICS, PHOTOGRAPHY, ETC. 
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 134 Illustrations. 
Fep. 8vo., 55. 
DRUDE.—THE THEORY OF OPTICS. By Pau. Drunks, 
Professor of Physics at the University of Giessen. Translated from the German 
by C. RIpoRG MANN and ROBERT A. MILLIKAN, Assistant Professors of 
Physics at the University of Chicago. With 110 Diagrams. 8vo., 15s. net. 
GLAZEBROOK.—PHYSICAL OPTICS. By R.'T. GtLaze- 
BROOK, M.A., F.R.S., Principal of University College, Liverpool. With 183 
Woodcuts of Apparatus, etc. Fcp. 8vo., 6s. 
VANDERPOEL.—COLOR PROBLEMS: a Practical Manual 
for the Lay Student of Color. By EMILY NOYES VANDRRPOEL. With 117 
Plates in Color. Square 8vo., 215. net. 
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., 65, 

