VI CONTENTS OF VOL. XLIV. FOURTH SERIES. 



NUMBER CCXCIV.— NOVExMBER. 



Page 

 Dr. A. M. Mayer on a Method of detecting the Phases of Vibra- 

 tion in the Air surrounding a Sounding Body, and thereby 

 measuring directly in the vibrating air the lengths of its 



Waves and exploring the form of its Wave-surface 321 



The Hon. J. W. Strutt on Bessel's Functions 328 



Dr. H. Morton on the Fluorescent Relations of certain solid 



Hydrocarbons found in Coal-tar and Petroleum Distillates. . 345 

 Dr. W. Marcet on the Nutrition of Muscular and Pulmonary 

 Tissues in Health and when affected with disease from 



Phthisis 349 



Prof. R. Clausius on the Connexion of the Second Proposition 



of the Mechanical Theory of Heat with Hamilton's Principle. 365 

 Mr. H. A. Smith on some Points in the Chemistry of Acid- 

 manufacture 370 



Mr. R. H. M. Bosanquet on an Experimental Determination of 

 the Relation between the Energy and Apparent Intensity of 



Sounds of different Pitch 381 



Notices respecting New Books : — 



Mr. R. A. Proctor's The Orbs around us : a Series of 

 familiar Essays on the Moon and Planets, Meteors and 



Comets, the Sun, and coloured Pairs of Suns 388 



Mr. C. Taylor's Geometry of Conies. — Part 1 390 



Mr. W. C, Ley's Laws of the Winds prevailing in West- 

 ern Europe 391 



Proceedings of the Royal Society : — 



The Hon. J. W. Strutt on the Reproduction of Diffraction- 

 gratings by means of Photography 392 



On the Anomalous Dispersion exhibited by certain Substances, 



by M. J. L. Soret 395 



On the Measurement of the Intensity of Currents by means of 



the Electrometer, by M. E. Branly 396 



On the Specific Heat of Hydrogenium, by James Dewar, F.R.S.E. 400 



NUMBER CCXCV.— DECEMBER. 



Captain F. W. Hutton on the Phenomena of the Elevation and 

 Subsidence of the Surface of the Earth 401 



Mr. G. K. Winter on the Relation which the internal Resistance 

 of the Battery and tb&-Conductivity of the Wire bear to the 

 maximum Magnetizing Force of an Electromagnet Coil. ... 414 



M. F. Zollner on the Spectroscopic Reversion-Telescope. (With 

 a Plate.) 417 



Dr. J. W. Draper's Researches in Actino-Chemistry. — Memoir 

 Second. On the Distribution of Chemical Force in the Spec- 

 trum 422 



