PLATES. 



I.-III. Illustrative of Prof. S. Young's Paper on the Generalizations 

 of Van der Waals regarding " Corresponding " Temperatures, 

 Pressures, and Volumes. 



IV. Illustrative of Prof. W. E. Ayrton and Mr. T. Mather's Paper on 

 the Construction of Non-inductive Resistances. 



V. Illustrative of Mr. H. L. Callendar's Paper on some Experiments 



with a Platinum Pyrometer on the Melting-points of Gold and 

 Silver. 



VI. & VII. Illustrative of Dr. G. J. Stoney's Paper on an Analysis of 



the Spectrum of Sodium. 



VIII. Illustrative of Mr. W. Baily's Paper on the Construction of a 

 Colour Map. 



