Scientific Works published by Longmans, Green, & Co. 13 

SOUND, LIGHT, HEAT, AND THERMODYNAMICS. . 
DEXTER.—ELEMENTARY PRACTICAL SOUND, LIGHT 
AND HEAT. By JosepH S. DEXTER, B.Sc. (Lond.), Physics Master, 
Technical Day School, The Polytechnic Institute, Regent Street. With 152 
Illustrations. Crown 8vo., 25. 6d. 
EMTAGE.—UIGHT. By W.T. A. Emtace, M.A., Director of 
Public Instruction, Mauritius. With 232 Illustrations. Crown 8vo., 6s. 
HELMHOLTZ.—ON THE SENSATIONS OF TONE AS A 
PHYSIOLOGICAL BASIS FOR THE THEORY OF MUSIC. By HER- 
MANN VON HELMHOLTZ. Royal 8vo., 28s. 
MAXWELL.—THEORY OF HEAT. By J. CLERK MAxwELL, 
M.A., F.R.SS., L. and E. With Corrections and Additions by Lord RAy 
LEIGH. With 38 Illustrations. Fep. 8vo., 45. 6d. 
SMITH.—THE STUDY OF HEAT. By J. Hamp.in SmItH, 
M.A., of Gonville and Caius College, Cambridge. Crown 8vo., 35. 
TYNDALL.—Works by JOHN TYNDALL, D.C.L, F.R.S. 
see p. 36. 
WORMELL.—A CLASS-BOOK OF THERMODYNAMICS. 
By RICHARD WORMELL, B.Sc., M.A. Fep. 8vo., 1s. 6d. 
WRIGHT.—Works by MARK R. WRIGHT, M.A. 
SOUND, LIGHT, AND HEAT. With 160 Diagrams and 
Illustrations. Crown 8vo., 2s. 6d. 
ADVANCED HEAT. With 136 Diagrams and numerous 
Examples and Examination Papers. Crown 8vo., 45. 6d. 
STEAM, OIL, AND GAS ENGINES. 
BALE.—A HAND-BOOK FOR STEAM USERS; being Rules 
for Engine Drivers and Boiler Attendants, with Notes on Steam Engine and 
Boiler Management and Steam Boiler Explosions. By M. Powis BALE, 
M.I.M.E., A.M.I.C.E. Fcp. 8vo., 25. 6d. 
CLERK.—THE GAS AND OIL ENGINE. By DuvucGaLp 
CLERK, Member of the Institution of Civil Engineers, Fellow of the Chemical 
Society, Member of the Royal Institution, Fellow of the Institute of Patent 
Agents. With 228 Illustrations. 8vo., 15s. 
