VI CONTENTS OF VOL. XXV. — FOURTH SERIES. 



Page 

 On the Stratification of the Electric Light, by M. Reitlinger. . 317 

 On the Spectrum produced by the Flame evolved in the Manu- 

 facture of Cast Steel, by Professor Roscoe 318 



On the Existence of a Crystallizable Carbon Compound and Free 



Sulphur in the Alais Meteorite, by Professor Roscoe 319 



On a New and extremely Sensitive Thermometer, by Dr. Joule. 320 

 On the Motion of Vapours toward the Cold, by Dr. T. Woods . 321 

 On some Specimens of Pseudomorphs, by Dr. Tschermak .... 323 

 Notes on the old Egyptian and Gregorian Calendars, by S. M. 



Drach, F.R.A.S 323 



On a Pseudomorph of Mica after Cordierite, by M. Haidinger. . 324 



NUMBER CLXIX.— MAY. 



Mr. W. Ellis on some Experiments showing the Change of Rate 

 produced in a Clock by a particular case of Magnetic Action. 325 



Mr. T. Tate's Experimental Researches on the Laws of Eva- 

 poration and Absorption 331 



Dr. Draper on the Motions of Camphor towards the Light, 

 and on Variations in the Fixed Lines of the Solar Spectrum. 342 



Sir David Brewster on the Polarization of Light by Rough and 

 White Surfaces 344 



Mr. A. Cayley on the Stereographic Projection of the Spherical 

 Conic 350 



Mr. B. Stewart's Reply to some remarks by G. Kirchhoff in his 

 Paper " On the History of Spectrum Analysis " 354 



Mr. C. Tomlinson on the Motion of Vapours toward the Cold. 360 



Mr. J. Hunter on the Absorption of Gases by Charcoal 364 



Prof. Tyndall's Remarks on the Dynamical Theory of Heat. . . . 368 



Dr. Mayer on Celestial Dynamics 387 



Proceedings of the Geological Society : — 



Mr. E. C. H. Day on the Middle and Upper Lias of the 

 Dorsetshire Coast 409 



On a Method of varying the Tension of the Discharge of an 

 Electric Battery, and of a Ruhmkorff's Coil, by M. A. Cazin. 410 



On some remarkable Numerical Approximations, by Charles M. 

 Willich, Esq. > . . , 411 



NUMBER CLXX.— JUNE. 



Prof. Callan on an Induction Coil of great power, and on the 

 effects of connecting Plates with the ends of the Secondary 



Coil 413 



Dr. Mayer on Celestial Dynamics 417 



Prof. W. Thomson on Prof. Tyndall's " Remarks on the Dyna- 

 mical Theory of Heat " 429 



Prof. Tait on the Conservation of Energy 429 



Prof. Maskelyne and Dr. Lang's Mineralogical Notes. (With 

 Four Plates.) 432 



