VI CONTENTS OF VOL. XLVI. FOURTH SERIES. 



Page 

 Determination of the Friction Besistances in Atwood's Ma- 

 chine, by C. Bender 330 



A remarkable Interference-phenomenon observed by M. Sekulic. 332 

 On the Filling of Vessels with a very Narrow Tube, especially 



the Cartesian Diver, by K. L. Bauer, of Karlsruhe 334 



Eesearches on the Spectrum of Chlorophyl, by J. Chautard . . 335 

 On the Direct Synthesis of Ammonia, by W. F. Donkin .... 336 



NTTMBEE CCCVIL— NOVEMBEE. 



Prof. O. Eeynolds on the Action of a Blast of Sand in cutting 

 hard Material 337 



M. F. Zollner on the Temperature and Physical Constitution of 



the Sun. (Second Memoir.) t 343 



Lord Eayleigh on the Vibrations of Approximately Simple 



Systems 357 



Mr. E. C. Nichols on the Determination of the Specific Heat 



of G-ases and Vapours at Constant Volumes 361 



Prof. J. D. Dana on some Eesults of the Earth's Contraction 

 from Cooling, including a discussion of the Origin of Moun- 

 tains. — Part V. Formation of the Continental Plateaux and 



Oceanic Depressions 363 



Mr. T. K. Abbott on the "Black Drop" in the Transit of 



Venus 375 



Mr. C. Tomlinson on the Motions of Camphor and of certain 



Liquids on the Surface of Water 376 



Prof. Challis on Integrating Differential Equations by Factors 

 and Differentiation, with Applications in the Calculus of 



Variations 388 



Dr. E. J. Mills on Statical and Dynamical Ideas in Che- 

 mistry. — Part IV. (conclusion). On the Idea of Motion . . 398 

 Notices respecting New Books : — 



Mr. B. Williamson's Elementary Treatise on the Differ- 

 ential Calculus, containing the Theory of Plane Curves, 



with numerous Examples 406 



Proceedings of the Eoyal Society : — 



Messrs. C. H. Stearn and G. H. Lee on the Effect of Pres- 

 sure on the Character of the Spectra of Gases 406 



Mr. J. N. Lockyer's Eesearches in Spectrum- Analysis in 

 connexion with the Spectrum of the Sun. — No. II. . . 407 

 On the Condensation of Gases and Liquids by Wood-charcoal. 

 Thermic Phenomena produced on the Contact of Liquids and 

 Charcoal. Liquefaction of the Condensed Gases, by M. Mel- 

 sens 410 



On the possible Existence of a Lunar Atmosphere, by E. 

 Neison, Esq 411 



