LIGHT. By W. T. A. EMTAGE, M.A. With 232 Illustrations.
Crown 8vo., 6_s._

_HELMHOLTZ._--ON THE SENSATIONS OF TONE AS A PHYSIOLOGICAL BASIS FOR
THE THEORY OF MUSIC. By HERMANN VON HELMHOLTZ. Royal 8vo., 28_s._

_MADAN._--AN ELEMENTARY TEXT-BOOK ON HEAT For the Use of Schools. By
H. G. MADAN, M.A., F.C.S., Fellow of Queen's College, Oxford; late
Assistant Master at Eton College. Crown 8vo., 9_s._

_MAXWELL._--THEORY OF HEAT. By J. CLERK MAXWELL, M.A., F.R.SS., L.
and E. With Corrections and Additions by Lord RAYLEIGH. With 38
Illustrations. Fcp. 8vo., 4_s._ 6_d._

_SMITH._--THE STUDY OF HEAT. By J. HAMBLIN SMITH M.A., of Gonville and
Caius College, Cambridge. Crown 8vo., 3_s._

_TYNDALL._--Works by JOHN TYNDALL, D.C.L., F.R.S See p. 28.

_WORMELL._--A CLASS-BOOK OF THERMODYNAMICS By RICHARD WORMELL, B.Sc.,
M.A. Fcp. 8vo., 1_s._ 6_d._

_WRIGHT._--Works by MARK R. WRIGHT, M.A.

SOUND, LIGHT, AND HEAT. With 160 Diagrams and Illustrations.
Crown 8vo., 2_s._ 6_d._

ADVANCED HEAT. With 136 Diagrams and numerous Examples and
Examination Papers. Crown 8vo., 4_s._ 6_d._

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., 2_s._ 6_d._

_CLERK._--THE GAS AND OIL ENGINE. By DUGALD CLERK, Associate 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., 15_s._

_HOLMES._--THE STEAM ENGINE. By George C. V. Holmes, Whitworth
Scholar, Secretary of the Institution of Naval Architects. With 212
Woodcuts. Fcp. 8vo., 6_s._

_NORRIS._--A PRACTICAL TREATISE ON THE 'OTTO' CYCLE GAS ENGINE. By
WILLIAM NORRIS, M.I.Mech.E. With 207 Illustrations. 8vo., 10_s._ 6_d._

_RIPPER._--Works by WILLIAM RIPPER, Professor of Mechanical
Engineering in the Sheffield Technical School.

STEAM. With 142 Illustrations. Crown 8vo., 2_s._ 6_d._

STEAM ENGINE THEORY AND PRACTICE. With 438 Illustrations.
8vo., 9_s._

_SENNETT AND ORAM._--THE MARINE STEAM ENGINE: A Treatise for
Engineering Students, Young Engineers and Officers of the Royal Navy
and Mercantile Marine. By the late RICHARD SENNETT, Engineer-in-Chief
of the Navy, etc.; and HENRY J. ORAM, Senior Engineer In