[y CONTENTS or vol. XL — fifth SERIES. 



Page 



Mr. c. r. FitEgerald on Professor Osborne Eeynolds's Paper 

 ••On certain Dimensional Properties of Matter in the Ga- 



Beooa State " 1 ^ 



Dr. P. Q-lan on a Spectrum-Telescope 110 



M. Bare. Nichola and Wheeler on the Coefficient of Expansion 



-..hit ions. (Plate 11.) 113 



Dp, k. Domatip on Alternating Discharges in vacuo . . , 121 



Mr. \V. lv. Browne on Action at a Distance . . 129 



Dr. A. Oberbeck on the Friction in Free Surfaces of Liquids . . 132 

 Notices respecting Now Books: — 



1 >r. EL 8. Ball's Elements of Astronomy 148 



M. J. Petersen's Elementary Plane Geometry 149 



Mr. K. M. Milbnrn's Mathematical Formulas _ 149 



Mr. E. Potts's Elementary Algebra, with brief notices of 



its Bistory 150 



Dr. T. Craig on the Motion of a Solid in a Fluid, and the 



Vibrations of Liquid Spheroids 150 



Proceedings of the Geological Society : — 



Mr. 0. Callaway on the Archaean Geology of Anglesey ; 



and on the Limestone of Durness and Assynt 151 



Prof. T. G. Bonney on a Boulder of llorblende-Pikrite 



near Pen-y-Carnisiog, Anglesey 152 



On the Motion of an Incompressible Viscous Fluid in the Vici- 

 nity of a Sphere, by Dr. A. Oberbeck 153 



On the Measurement of the Electromotive Force of the Pile, 



by M. J.-B. Bailie 153 



A Study on Spectrophotometers, by M. A. Crova 155 



NUMBEE LXV1L— MAECH. 



Dr. J. W. Draper on the Phosphorograph of a Solar Spectrum, 

 and on the Lines in its Infra-red Eegion 157 



Dr. C. B. A. Wright on the Determination of Chemical Affinity 

 in terms of Electromotive Force. — Part III 169 



Lord Rayleigh on Copying Diffraction-gratings, and on some 

 Phenomena connected therewith 196 



M r. .J. B. Lawes on the Formation and Decomposition of Car- 

 bonic; Acid 206 



Lieut. L. Darwin on the Eate of the Decrease of the Light 

 given off by a Phosphorescent Surface 209 



Mr. .J. Brown on the Theory of Voltaic Action 212 



Lord Rayleigh on Images formed without Ee flection or Ee- 

 i'ract ion 214 



Mr. S. T. Preston on Action at a Distance 218 



Dr. 0. J. Lodge on Action at a Distance 220 



