VI. Electrification of Air, of Vapour of Water, and of Other Gases. By Lord 



KELVIN, G.C.V.O., F.R.S., MAGNUS MACLEAN, D.Sc., F.R.S.E., and ALEX- 

 ANDER GALT, B.Sc., F.R.S.E. page 187 



VII. Mathematical Contributions to the Theory of Evolution. IV. On the Probable 



Errors of Frequency Constants and on the Influence of Random Selection on 

 Variation and Correlation. By KARL PEARSOX, F.R.S., and L. N. G. FILON, 

 B.A., University College, London 229 



VIII. A Compensated Interference Dilatometer. By A. E. TUTTON, Assoc. R.C.S. 



Communicated by Capt. ABNEY, C.B., F.R.S. 313 



IX. The Electric Conductivity of Nitric Acid. By V. H. VELEY, M.A., F.R.S., and 



J. J. MANLEY, Daubeny Curator, Magdalen College, Oxford .... 365 



X. On the Thermal Conductivities of Single and Mixed Solids and Liquids and their 



Variation ivith Temperature. By CHARLES H. LEES, D.Sc., Assistant Lec- 

 turer in Physics in the Owens College. Communicated by Professor ARTHUR 

 SCHUSTER, F.R.S. 399 



XL Experiments on Aneroid Barometers at Kew Observatory, and their Discussion. 

 By C. CHREE, Sc.D., LL.D., F.R.S. , Superintendent. Communicated by the 

 Author at the Request of the Kew Observatory Committee 441 



XII. On the Heat Dissipated by a Platinum Surface at High Temperatures. By 

 J. E. PETAVEL, 1851 Exhibition Scholar. Communicated by Lord RAYLEIGH, 

 F.R.S. 501 



Index to Volume 525 



