PLATES. 



I. Illustrative of Dr. E. H. Barton and Mr. C. A. B. Garrett's 

 Paper on the Vibration Curves simultaneously obtained 

 from a Monochord Sound-Box and String. 

 II. Illustrative of Mr. G. B. Dyke's Paper on the Flux of Light 

 from the Electric Arc with Varying Power-Supply. 

 III. & IV. Illustrative of Mr. K. Honda's Paper on a Portable Aero- 

 mercurial Tide-Gauge. 

 V. Illustrative of Prof. R. W. Wood's Paper on the Magneto- 

 Optics of Sodium Vapour and the Rotatory Dispersion 

 Formula. 

 VI. Illustrative of Prof. R. W. Wood's Paper on the Scintil- 

 lations produced by Radium. 

 VII. Illustrative of Prof. R. W. Wood's Paper on the Fluores- 

 cence of Sodium Vapour and the Resonance Radiation of 

 Electrons. 

 VIII. Illustrative of Prof. A. S. Mackenzie's Paper on the Deflexion 

 of a, Rays from Radium and Polonium. 

 IX.-XII. Illustrative of Messrs. K. Honda and S. Shimizu's Paper on 

 the Magnetization and the Magnetic Change of Length 

 in Ferromagnetic Metals and Alloys at Temperatures 

 ranging from -186° C. to +1200° C. 

 XIII. Illustrative of Mr. Glenn Moody Hobbs's Paper on the 

 Relation between P.D. and Spark-length for Small Values 

 of the latter. 



