EXCELLENT

KING EDWARD VII.

Vice-Patron and Honorary Member.

HIS ROYAL HIGHNESS

THE PRINCE OF WALES, K.G. G.C.V.O. LL.D. F.R.S.

President-THE DUKE OF NORTHUMBERLAND, K.G. D.C.L. F.R.S. Treasurer-SIR JAMES CRICHTON-BROWNE, M.D. LL.D. F.R.S.-V.P. Honorary Secretary-SIR WILLIAM CROOKES, D.Sc. F.R.S.-V.P.

Managers, 1905-1906.

Sir William de W. Abney, K.C.B. D.C.L.
D.Sc. F.R.S.-V.P.

The Right Hou. Lord Alverstone,

G.C.M.G. M.A. LL.D. F.R.S.-V.P. Henry E. Armstrong, Esq. Ph.D. LL.D. F.R.S.

Shelford Bidwell, Esq. M.A. Sc.D.

LL.B. F.R.S.-V.P.

Sir Alexander Binnie, M.Inst.C.E.
The Hon. Sir Henry Burton Buckley,
M.A.

The Right Hon. Charles Scott Dickson,
K.C. M.P. M.A. LL.D.
Francis Elgar, Esq. LL.D. F.R.S.
M. Inst. C.E.

Maures Horner, Esq. J.P. F.R.A.S.
Ludwig Mond, Esq. Ph.D. F.R.S.-
V.P.

Sir Andrew Noble, Bart. K.C.B. D.Sc.
F.R.S.

The Right Hon. the Earl of Rosse, K.P.
D.C.L. LL.D. D.Sc. F.R.S.-V.P.
The Right Hon. Lord Sanderson, G.C.B.
K.C.M.G.-V.P.

Alexander Siemens, Esq. M.Inst.C.E.
Silvanus P. Thompson, Esq. B.A. D.Sc.
F.R.S.

Visitors, 1905-1906.

William Arthur Brailey, M.D. M.A.
M.R.C.S.

John Mitchell Bruce, Esq. M.A. M.D.
LL.D.

The Right Hon. Earl Cathcart, D. L. J.P.
Sir John George Craggs, M.V.O.
James Mackenzie Davidson, Esq. M.B.
C.M.

Francis Fox, Esq. M.Inst.C.E.
Robert Kaye Gray, Esq. M.Inst.C.E.
Charles Edward Groves, Esq. F.R.S.
A. Kirkman Loyd, Esq. M.P. K.C.
Sir Philip Magnus, J.P. B.A. B.Sc.
Carl E. Melchers, Esq.
Emile R. Merton, Esq.

George Johnstone Stoney, Esq. M.A.
D.Sc. F.R.S.

John Jewell Vezey, Esq. F.R.M.S.
George Philip Willoughby, Esq. J.P.
Professors.

Honorary Professor of Natural Philosophy-The Right Hon. LORd Rayleigh, O.M. M.A. D.C.L. LL.D. Sc D. F.R.S. &c.

Professor of Natural Philosophy-JOSEPH JOHN THOMSON, Esq. M.A. LL.D. D.Sc. F.R.S. &c.

Fullerian Professor of Chemistry-Sir JAMES DEWAR, M.A. LL.D. D.Sc. F.R.S. &c.

Fullerian Professor of Physiology-WILLIAM STIRLING, M.D. LL.D. D.Sc.

Keeper of the Library and Assistant Secretary-Mr. Henry Young.

Assistant in the Library-Mr. Ralph Cory.

Assistants in the Laboratories-Mr. R. N. Lennox, F.C.S., Mr. J. W. Heath, F.C.S.

CONTENTS.

1902.

1902.

Jan. 17.-THE RIGHT HON. LORD RAYLEIGH-Interference of

PAGE

24.-H. G. WELLS, Esq.-The Discovery of the Future
31.—PROFESSor A. Crum Brown, M.D.—The Ions of

8

7.-PROFESSOR E. RAY LANKESTER-The New Mammal
from Central Africa, and other Giraffe-like
Animals

14.-MAJOR P. A. MACMAHON, R.A.-Magic Squares
and other Problems on a Chess-Board
21.-W. DUDDELL, Esq.-Musical and Talking Electric

Arcs

28.-PROFESSOR HENRY A. MIERS-Gold-Mining in

48

50

64

72

82

7.-PROFESSOR H. BECQUEREL-Radio-Active Bodies
(in French)

21.-GEHEIMRATH PROFESSOR OTTO N. WITT-Recent

Developments in Colouring Matters

85

219

95

108

11.-PROFESSOR DEWAR-Problems of the Atmosphere

223

April 7.-General Monthly Meeting