﻿VI CONTENTS OF VOL. XLI. FOURTH SERIES. 



Page 

 Archdeacon Pratt on the Constitution of the Solid Crust 



of the Earth 307 



Mr. G. Gore on Fluoride of Silver 309 



Mr. C. F. Varley on the Polarization of Metallic Surfaces 



in Aqueous Solutions 310 



Mr. H. Mance on the Measurement of Electrical Resistance. 314 

 Mr. H. Mance on the Measurement of the Internal Re- 

 sistance of a Multiple Battery by adjusting the Galvano- 

 meter to Zero 318 



Proceedings of the Geological Society : — 



Prof. O. Heer on the Carboniferous Flora of Bear Island. 318 

 Mr. S. V. Wood, Jun., on the Denudation of the Valley of 



the Weald 319 



Mr. G. W. Stow on some Points of South- African Geology. 320 

 Mr. J. W. Hulke on some Reptilian Fossils from Gozo . . 320 

 Dr. F. R. Fairbank on the Discovery of a " Bone-bed " in 

 the lowest of the " Lynton Grey Beds," North Devon. . 320 



On the Curve of a River's Bed, by Samuel Sharpe, Esq 321 



A New Experiment, and some Remarks on the Theory of Lei- 

 denfrost's Phenomenon, by E. Budde 322 



NUMBER CCLXXIV.— MAY. 



Mr. J. K. Laughton on Barometric Differences and Fluctuations. 325 



Dr. R. E. Dudgeon on Subaqueous Vision 350 



Mr. M. Hall on the Determination of the Height of the Atmo- 

 sphere 353 



Prof. Cayley on the Attraction of a Terminated Straight Line. 358 



Sir James Cockle on Fractional Criticoids 360 



Prof. Challis on a Theory of the Mutual Action between Elec- 

 trified and Magnetized Bodies 368 



M. G. Quincke on the Capillary Phenomena of the common 



Surface of two Liquids , 370 



Mr. C. W. Vincent on the Relations of Magnetism and Static 



Electricity > . . # 390 



Prof. R. Bunsen on Calorimetric Researches 392 



Proceedings of the Royal Society : — 



Canon Moseley on the Uniform Flow of a Liquid 394 



Prof. J. Phillips on the Eclipse at Oxford, December 22, 



1870 396 



Proceedings of the Royal Institution : — 



Mr. W. Spottiswoode on some Experiments on Successive 

 Polarization of Light made by Sir C. Wheatstone .... 398 

 On a Barometer without Mercury, by A. Heller, Professor of 



Physics in the Ober-Realschule in Ofen 401 



Inversion of the Sodium-line, by A. Weinhold . . 404 



