PLATES. 
I. & II. Mustrative of Prof. S. P. Langley’s Paper on a possible 
Variation of the Solar Radiation, and its probable Effect 
on Terrestrial Temperatures. 
III. Illustrative of Mr. W. Duddell’s Paper on some Instru- 
ments for the Measurement of Large and Small 
Alternating Currents. 
IV. Illustrative of Prof. J. A. Fleming’s Paper on a Model 
illustrating the Propagation of a Periodic Electric 
Current in a Telephone Cable. 
V.-IX. Lllustrative of Mr. G. T. Beilby’s Paper on the Hard and 
Soft States in Metals. 
X.—-XII. Illustrative of Prof. R. W. Wood’s Paper on a Quanti- 
tative Determination of the Anomalous Dispersion of 
Sodium Vapour in the Visible and Ultra-Violet 
Regions. 
XIII. Illustrative of Prof. J. A. Fleming’s Paper on the Pro- 
pagation of Electric Waves along Spiral Wires, and 
on an Appliance for Measuring the Length of Waves 
used in Wireless Telegraphy. 
XIV. & XY. Illustrative of Prof. Trouton and Mr. Rankine’s Paper 
on the Stretching and Torsion of Lead Wire beyond 
the Elastic Limit. 
XVI. Illustrative of Prof. W. B. Morton and Mr. T. B. Viny- 
comb’s Paper on the Vibrations of Strings excited by 
Plucking and by Resonance. 
XVII. Illustrative of Mr. C. A. B. Garrett's Paper on the 
Lateral Vibration of Bars. 
XVIII. Illustrative of Prof. W. H. Bragy’s Paper on the 
Absorption of # Rays. 
ERRATA, 
Page 267, line 4, for (Figs. 5-14) read (Figs. 9-20). 
9» 099 Sy: 18, for (Figs. 4-12) read (Figs. 9-20). 
», 064, Table VI. for electrostatic capacity 1:63 cm. read electro- 
static capacity 0°63 cm. 
