CONTENTS OF VOL. XL 



(FIFTH SEEIES). 



NUMBEE LXV.— JANUAEY 1881. 



Page 

 MM. Lecher and Pernter on the Absorption of dark Heat-rays 



by Gases and Vapours. (Plate I.) 1 



Messrs. Carnelley and O'Shea on a Eelation between the 

 Melting-points of the Elements and their Solid Binary Com- 

 pounds and the Heats of Formation of the latter 28 



Dr. 0. J. Lodge on Action at a Distance 36 



Mr. S. T. Preston on Action at a Distance 38 



Mr. H. M'Coll on Implication al and Equational Logic 40 



Messrs. Ayrton and Perry on Prof. Exner's Papers on Contact 



Electricity ' 43 



Dr. J. H. Gladstone on the Specific Eefraction and Dispersion 



of Isomeric Bodies 54 



Messrs. Brauner and Watts on the Specific Volumes of Oxides 60 



Dr. Brauner on the Atomic Weight of Beryllium 65 



Proceedings of the Geological Society : — 



Messrs. H. Keeping and E. B. Tawney on the Beds at 



Headon Hill and Colwell Bay in the Isle of Wight . . 72 

 Mr. J. A. Phillips on the Constitution and History of 



Grits and Sandstones 73 



Note on Mr. Browne's Paper " On Action at a Distance," by 

 Eev. A. J. C. Allen, B.A., Fellow and Assistant Tutor of 



Peterhouse, Cambridge 74 



A Contribution to the Theory of so-called Electrical Expan- 

 sion or Electrostriction, by Prof. L. Boltzmann, of Graz . . 75 

 On the Absorption of Solar Badiation by the Carbonic Acid of 



our Atmosphere, by Dr. Ernst Lecher 76 



Spectral Eeaction of Chlorine and Bromine, by M. Lecoq de 



Boisbaudran 77 



On Eadiophony, by M. E. Mercadier 78 



NTJMBEE LXVL— FEBBUAEY. 



Prof. G. Kirchhoff on the Measuring of Electrical Conducti- 

 vities 81 



Mr. C. S. Hastings's Theory of the Constitution of the Sun, 

 founded upon Spectroscopic Observations, original and otter 91 



