IV CONTENTS OF VOL. XXII. — FOURTH SERIES. 



Page 



Mr. R. P. Greg on New Falls of Meteoric Stones 107 



Prof. Challis on the Solution of a Problem in the Calculus of 



Variations 108 



Mr. C. Tomlinson on the Action of certain Vapours on Films ; 

 on the Motions of Creosote on the surface of Water, and other 



phenomena Ill 



Prof. W. Thomson on the Reduction of Observations of Under- 

 ground Temperature ; with Application to Professor Forbes's 

 Edinburgh Observations, and the continued Calton Hill Series. 121 

 Dr. Atkinson's Chemical Notices from Foreign Journals .... 135 



Prof. Sylvester on the Tactic of 9 Elements 144 



Proceedings of the Royal Institution : — 



Prof. Tyndall on the Physical Basis of Solar Chemistry . . 147 

 Proceedings of the Royal Society : — 



Dr. Hofmann on Compound Ammonias by Inverse Substi- 

 tution 156 



Dr. Hofmann on anomalous Vapour-densities 158 



Dr. Hofmann on Sulphamidobenzamine 160 



Proceedings of the Geological Society : — 



M. A. Fontan on two Bone-caves in the Mountain of Ker, 



at Massat . , 164 



Mr. J. Prestwich on some further Discoveries of Flint Im- 

 plements in the Drift 1 65 



Mr. J. G. Jeffreys on the Corbicula (or Cyrena fluminalis) 



geologically considered 165 



On a Photographic Micrometer, by Thomas Woods, M.D 166 



On the Boiling of Liquids, by M. L. Dufour 167 



NUMBER CXLVI.— SEPTEMBER. 



Prof. Tyndall on the Absorption and Radiation of Heat by Gases 

 and Vapours, and on the Physical Connexion of Radiation, 

 Absorption, and Conduction. — The Bakerian Lecture. (With 



a Plate.) 169 



Dr. A. Matthiessen on Dr. Siemens's Paper " On Standards of 

 Electrical Resistance, and on the Influence of Temperature 



on the Resistance of Metals " 195 



Prof. W. Thomson and Mr. F. Jenkin on the True and False 



Discharge of a Coiled Electric Cable 202 



Mr. J. A. Wanklyn on the Movements of Gases 211 



Dr. Holzmann on some Cerium Compounds 216 



Mr. J. Z. Laurence on the Sensibility of the Eye to Colour . . 220 

 Prof. W. Weber on the Measurements of Electric Resistance 



according to an absolute Standard , 226 



Notices respecting New Books : — The Rev. N. M. Ferrers' s 

 Elementary Treatise on Trilinear Coordinates, the Method of 

 Reciprocal Polars, and the Theory of Projections 240 



