PLATES. 



I. Illustrative of Dr. J. N. Kruseinan's Paper on the Potential of the 

 Electric Field in the neighbourhood of a Spherical Bowl, charged 

 or under influence. 



II. Illustrative of Dr. G. A. Liebig's Paper on the Electrostatic Force 

 required to produce Sparks in Air and other Gases. 



III., IV., V. Illustrative of Drs. W. Ramsay and S. Young's Paper 

 on the Continuous Change from the Gaseous to the Liquid State 

 at all Temperatures. 



VI. & VII. Illustrative of Mr. R. H. M. Bosanquet's Paper on the Pro- 

 duction of Sudden Changes in the Torsion of a Wire by Change 

 of Temperature. 



VIII. Illustrative of Mr. J . Buchanan's Paper on Hot Gases as Conductors 

 of Electricity. 



IX. Illustrative of Mr. J. T. Bottomley's Paper on Expansion and 

 Contraction with Rise and Fall of Temperature in "Wires under 

 Elongating Stress. 



ERRATUM. 



Page 195.— In equation (49) of SirW. Thomson's paper, for L%) -f MF(y) read 



__J_^ ) [ ey y(»H^)£ %€ - ! ,V(».^ 32 )( L/(2/)+ MF(j / )) 



