PLATES. 



I.-V. Illustrative of Messrs. K. Honda and T. Terada's Paper on 

 the Change of Elastic Constants of Ferromagnetic 

 Substances by Magnetization. 

 VI. Illustrative of Prof. B. Hopkinson's Paper on the Measure- 

 ment of Gas-Engine Temperatures. 

 VII. Illustrative of Mr. J. M. Baldwin's Paper on the Behaviour 

 of Iron under Small Periodic Magnetizing Forces. 

 VIII. Illustrative of Lord Rayleigh's Acoustical Notes. 

 IX. Illustrative of Prof. W. H. Bragg's Paper on the Ionization 

 of Various Gases by the a. particles of Radium. 

 X. Illustrative of Prof. J. Joly's Paper on Pleochroic Halos. 

 XL & XII. Illustrative of Prof. E. H. Barton and Mr. J. Penzer's Paper 

 on Simultaneous Vibration-Curves of String and Bridge 

 photographically obtained from a Monochord. 



XIII. Illustrative of Prof. T. R. Lyle's Paper on Transformer 



Indicator Diagrams. 



XIV. Illustrative of Mr J. Mead Adams's Paper on a Spectrum of 



the Rontgen Rays from a Focus Tube. 

 XV. Illustrative of Prof. F. T. Trouton and Mr. S. Russ's Paper 

 on the Rate of Recovery of Residual Charge in Electric 

 Condensers. 

 XVI. Illustrative of Prof. E. L. Hancock's Paper on Recovery of 

 Nickel and Carbon Steel from Overstrain. 

 XVII. Illustrative of Dr. J. T. Bottomley and Mr. F. A. King's 

 Paper on Experiments with Vacuum Gold-leaf Electro- 

 scopes on the Mechanical Temperature Effects in Rarefied 

 Gases. 



