SOLD BY SIMPKIN, MARSHALL, HAMILTON, KENT, AND CO., LD.-T. AND T. CLARK,
EDINBURGII;-SMITH AND SON, GLASGOW ;-HODGES, FIGGIS, AND
CO., DUBLIN:-PUTNAM, NEW YORK;-YEUVE J. BOYVEAU,
PARIS; AND ASHER AND CO., BERLIN.

"Meditationis est perscrutari occulta; contemplationis est adminari perspicua.... Admiratio generat quæstionem, quæstio investigationem, investigatio inventionem."-Hugo de S. Victore.

CONTENTS OF VOL. VII.

(SIXTH SERIES).

NUMBER XXXVII.~JANUARY 1904.

Prof. A. Schuster on a Simple Explanation of Talbot's Bands.

Dr. H. A. Bumstead on the Variation of Entropy as treated

by Prof. Willard Gibbs ...

Page

1

Rev. O. Fisher on Deflexions of the Plumb-line in India....

Mr. A. H. Pfund: A Study of the Selenium Cell....

Dr. C. Chree on the Bending of Magnetometer Deflexion-Bars. 39

Dr. G. E. Allan on the Magnetism of Basalt and the Magnetic

Behaviour of Basaltic Bars when Heated in Air. (Plates

1. & II.).

Mr. P. E. B. Jourdain on the Transfinite Cardinal Numbers

of Well-ordered Aggregates

Prof. J. D. Everett on Borgnet's Method of Dividing an

Angle in an Arbitrary Ratio

Notices respecting New Books:-

Charles Nordmann: Essai sur le rôle des Ondes Hertzi-

ennes en Astronomie Physique

Proceedings of the Geological Society:-

Mr. E. E. Walker on the Garnet-bearing and Associated

Rocks of the Borrowdale Volcanic Series

...

45

61

75

13

77

79

Prof. J. W. Gregory on the Glacial Geology of Tasmania. 80

NUMBER XXXVIII.-FEBRUARY.

Mr. R. K. McClung on the Effect of Temperature on the

Ionization produced in Gases by the Action of Röntgen

Rays

81

Dr. E. Weintraub: Investigation of the Arc in Metallic

Vapours in an Exhausted Space. (Plates III.-XI.) ... 95

Mr. C. A. Chant on the Variation of Potential along the

Transmitting Antenna in Wireless Telegraphy. (Plates

XII. & XIII.)

....

Mr. S. J. Allan on the Radioactivity of the Atmosphere.

(Plate XIV.)..

124

140