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OF THE

FORTY-NINTH MEETING

OF THE

BRITISH ASSOCIATION

FOR THE

ADVANCEMENT OF SCIENCE;

HELD AT

SHEFFIELD IN AUGUST 1879.

LONDON:

JOHN MURRAY, ALBEMARLE STREET.

1879.

Office of the Association: 22 ALBEMARLE STREET, LONDON, W.

LONDON: PRINTED BY

SPOTTISWOODE AND CO., NEW-STREET SQUARE AND PARLIAMENT STREET

CONTENTS.

Page

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Fourth Report of the Committee, consisting of Dr. JOULE, Professor Sir WIL-

LIAM THOMSON, Professor TAIT, Professor Balfour Stewart, and Professor

J. CLERK MAXWELL, appointed for the purpose of effecting the Determina-

tion of the Mechanical Equivalent of Heat

Report of the Committee appointed for the purpose of endeavouring to pro-

cure Reports on the Progress of the Chief Branches of Mathematics and

Physics; the Committee consisting of Professor G. CAREY FOSTER (Secre-

tary), Professor W. G. ADAMS, Professor R. B. CLIFTON, Professor CAYLEY,

Professor J. D. EVERETT, Professor CLERK MAXWELL, Lord RAYLEIGH,

Professor G. G. STOKES, Professor BALFOUR STEWART, Mr. SPOTTISWOODE,

and Professor P. G. TAIT

Twelfth Report of the Committee, consisting of Professor EVERETT, Professor

Sir WILLIAM THOMSON, Professor J. CLERK MAXWELL, Mr. G. J. SYMONS,.

Professor RAMSAY, Professor GEIKIE, Mr. J. GLAISHER, Mr. PENGELLY,

Professor EDWARD HULL, Professor ANSTED, Dr. Clement Le Neve Foster,

Professor A. S. HERSCHEL, Mr. G. A. LEBOUR, Mr. A. B. WYNNE, Mr. GAL-

LOWAY, Mr. JOSEPH DICKINSON, and Mr. G. F. DEACON, appointed for the

purpose of investigating the Rate of Increase of Underground Temperature

downwards in various Localities of Dry Land and under Water. Drawn up

by Professor EVERETT (Secretary)

Report of the Committee, consisting of Professor CAYLEY, F.R.S., Professor

G. G. STOKES, F.R.S., Professor H. J. S. SMITH, F.R.S., Professor Sir

WILLIAM THOMSON, F.R.S., Mr. JAMES GLAISHER, F.R.S., and Mr. J. W.

L. GLAISHER, F.R.S. (Secretary), on Mathematical Tables. Drawn up by

Mr. J. W. L. GLAISHER..

Sixth Report of a Committee, consisting of Professor A. S. HERSCHEL, M.A.,

F.R.A.S., Professor G. A. LEBOUR, F.G.S., and Mr. T. J. DUNN, B.Sc.,

on Experiments to determine the Thermal Conductivities of certain Rocks,

showing especially the Geological Aspects of the Investigation

Report of a Committee, consisting of Professor G. FORBES, Professor Sir

WILLIAM THOMSON, and Professor EVERETT, appointed to obtain Observa-

tions on Atmospheric Electricity at Madeira. Drawn up by Dr. GRABHAM,

Madeira

Report of the Committee, consisting of Professor SYLVESTER, F.R.S., and

Professor CAYLEY, F.R.S., appointed for the purpose of calculating Tables of

the Fundamental Invariants of Algebraic Forms

Report of the Committee, consisting of the Rev. SAMUEL HAUGHTON, M.D.,

and BENJAMIN WILLIAMSON, M.A., appointed for the Calculation of Sun-

Heat Coefficients. Drawn up by Dr. HAUGHTON

Second Report of the Committee, consisting of Professor Sir WILLIAM THOM-

SON, Dr. MERRIFIELD, Professor OSBORNE REYNOLDS, Captain DOUGLAS

GALTON, and Mr. J. N. SHOOLBRED (Secretary), appointed for the purpose

of obtaining information respecting the Phenomena of the Stationary Tides

in the English Channel and in the North Sea; and of representing to the

Government of Portugal and the Governor of Madeira that, in the opinion

of the British Association, Tidal Observations at Madeira or other islands

in the North Atlantic Ocean would be very valuable, with the view to the

advancement of our knowledge of the Tides in the Atlantic Ocean.

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