CONTENTS OF VOL. IV. FIFTH SERIES. VU 



Page 

 Mr. W. H. Walenn on Unitatioii. — VI L. Practical Remarks 



thereou, together with Examples STo 



Dr. J. II. Grladstoue on some Points connected with the Che- 

 mical Constituents of the Solar Ss'stem 379 



Notices respecting New Books : — 



Mr. Gr. M. Minchin's Treatise on Statics, containing some 



of the fundamental propositions in Electrostatics . . . 386 

 Mr. E. 11. M. Bosanqnet's Elementary Treatise on Mu- 

 sical InterA^als and Temperament, with an account of 

 an Enharmonic Harmoninm and an Enharmonic Organ 387 

 Proceedings of the Eoyal Society : — 



Prof. Norris on certain Molecular Changes ^hich occur 

 in Iron and Steel during the separate acts of Heating 



and Cooling 389 



Fresh Researches on the Metal Davyum, bv M. Serge Kern. . 395 



On the Gamut of Light, by Prof. Pliny Earle Chase 396 



On the Elnorescence of the Living Eetina, bv M, von Bezold 

 and Dr. G. Engelhardt ! 397 



NUMBEE XXVII.— DECEMBEE. 



Prof. H. Bu:ff on the Thermal Conductivity and Diathermancy 

 of Air and Hydrogen 401 



Mr. G. J. Stonev on the Penetration of Heat across Layers of 

 Gas .' 424 



Mr. J. Moser on the Spectra of Chemical Compounds 444 



Mr. E. S. Brough's Theoretical Deduction of the best Eesist- 

 ance of a Telegraph Eeceiviug-iustrument 449 



Prof. E. Clausius on a General Theorem respecting Electrical 

 Influence 454 



Colonel A. E. Clarke on the Potential of an ElKpsoid at an Ex- 

 ternal Point 458 



M. J. Habermann on a Modification of Dumas's Method of 

 Determining Vapour-Densities 462 



On the Magnetization of Steel Tubes, by J.-M. Gaugain . . . .■ 468 



On the Disaggregation of Tin 470 



On the exact Measure of the Heat of Solution of Sulphuric 

 Acid in "Water, by M. Croullebois 471 



