CONTENTS OF VOL. VIII.— FIFTH SERIES. V 



Page 



Prof. AY .Grylls Adams on Measuring Polariscopes. (Plate VIII.) 275 



Dr. 0. J. Lodge on a Systematic Classification of the various 

 Forms of Energy 277 



Mr. W. Baily on a Mode of producing Arago's Botation. 

 (Plates IX.'&'X.) 286 



Mr. E. H. M. Bosanquet on the Present State of Experimen- 

 tal Acoustics, with Suggestions for the Arrangement of an 

 Acoustic Laboratory, and a Sketch of Besearch 290 



Dr. T. Carnelley on the Influence of Atomic Weight 305 



Prof. E. Bosetti's Experimental Eesearches on the Temperature 

 of the Sun 324 



Notices respecting New Books : — 



Prof. S. Newcomb's Eesearches on the Motion of the 

 Moon, made at the United States Naval Observatory, 

 Washington .' . 332 



On a Visual Phenomenon and its Explanation, by William 

 Ackroyd, E.I.C. : 334 



Precis of a Eeport on Electric-light Experiments, by L. 

 Schwendler, Esq 335 



The True Theory of Fresnel's Interference Phenomena, by H. 

 E. Weber . . ! 339 



An Absorption Hygrometer, by A. van Hasselt 340 



XUMBEE L.— NOVEMBEB. 



Dr. Carl Barus on the Eelation between the Thermoelectric 

 Properties, the Specific Eesistance, and the Hardness of 



Steel. (Plate XI. figs. 1-6) 341 



Dr. T. Carnelley on the Influence of Atomic Weight 368 



Mr. G. E. Fitzgerald on the Tension of Vapours near Curved 



Surfaces of their Liquids t 382 



Dr. S. P. Thompson on the Pseudophone 385 



Dr. W. Spottiswoode on a Mode of Exciting an Induction-coil 390 

 Mr. L. Schwendler on a new Standard of Light. (Plate XL 



figs. 7-10.) 392 



Lord Eayleigh's Investigations in Optics, with special refer- 

 ence to the Spectroscope 403 



Mr. W. Grant on the Conjugate Positions of two Circular Coils 



of Wire. (Plate XII.) 412 



Notices respecting New Books : — 



Mr. L. Schwendler's Instructions for testing Telegraph- 



Lines and the technical Arrangement of Offices 417 



Proceedings of the Geological Society : — 



Prof. T. M'Kenny Hughes on the Pre-Cambrian Bocks of 



Caernarvon -\\ ( .) 



Messrs. A. Champeniowne and W. A. E. Ussher on the 

 Structure of the Palaeozoic Districts of West Somerset 419 



