VI CONTENTS OF VOL. XXIII. FOURTH SERIES. 



Page 

 Proceedings of the Royal Society : — 



Mr. M. Simpson on the Synthesis of Succinic and Pyro- 



tartaric Acids 326 



Mr. B. Stewart on Internal Radiation in Uniaxal Crystals. 328 

 Proceedings of the Geological Society : — 



Messrs. Whitley and Wyatt on some further Discoveries of 



Flint Implements 331 



Mr. W. B. Dawkins on a Hysena-den near Wells 332 



Messrs. Palmieri and Tchihatcheff on the Recent Eruption 



of Vesuvius 332 



Mr. E. Hull on the Distribution of Sedimentary Strata . . 333 

 On the Probable Cause of Electrical Storms, by Dr. J. P. Joule. 334 

 On the Influence of Heat on Phosphorescence, by M. O. Fiebig. 335 

 On the Resistance to the Conduction of Heat, by J. M. Rankine. 336 



NUMBER CLV.— MAY. 



M. V. Regnault on some Apparatus for determining the Densi- 

 ties of Gases and Vapours. (With a Plate.) 337 



Mr. G. J. Stoney on the Correction for the Length of the 



Needle in Tangent- galvanometers. . . . „ 345 



Prof. Chapman on the Position of Lievrite in the Mineral Series. 348 

 Mr. A. Cayley on a Question in the Theory of Probabilities . . 352 

 Mr. J. Croll's Remarks on Ampere's Experiment on the Repul- 

 sion of a Rectilinear Electrical Current on itself 365 



Mr. T. Graham on Liquid Diffusion applied to Analysis 368 



Mr. R. T. Lewis on the Changes in the Apparent Size of the 



Moon 380 



Mr. S. V. Wood on the Form and Distribution of the Land- tracts 

 during the Secondary and Tertiary Periods respectively ; and 

 on the effects upon Animal Life which great Changes in 



Geographical Configuration have probably produced 382 



Mr. B. Stewart on the Occurrence of Flint Implements in the 



Drift 394 



Proceedings of the Royal Institution : — 



Rear-Admiral FitzRoy on Meteorological Telegraphy. . . . 395 

 Proceedings of the Royal Society ; — 



Prof. J. Thomson on Regelation 407 



Proceedings of the Geological Society : — 



The Rev. W. Lister on the Drift containing Arctic Shells 



in the neighbourhood of Wolverhampton 412 



Mr. J. Smith on a Split Boulder in Little Cumbra 412 



Mr. T. F. Jamieson on the Ice-worn Rocks of Scotland. . 412 

 Prof. Ramsay on the Glacial Origin of certain Lakes in 



Switzerland, &c 413 



On the Phosphorescence of Rarefied Gases, by M. Morren . . 415 

 On the Spectra of Phosphorus and Sulphur, by M. J. M.-Seguin. 416 



