CONTENTS OF VOL. XVITI.- — FIFTH SERTES. Vll 



NUMBER CXY.— DECEMBER. 



Page 

 C. Fromme on the Changes produced in the Molecular Con- 

 dition of Iron by Heating to Redness and Cooling 473 



Prof. J. Loudon on Geometrical Methods in the Theory of 



Refraction at one or more Spherical Surfaces. (Plate X.) 485 

 Mr. R. H. M. Bosanquet on the supposed Repulsion between 



Magnetic Lines of Force 494 



Frederick Guthrie on some Thermal and Volume Changes 



attending Mixture 495 



Mr. J. "W. L. Glaisher on Applications of Mobius's Theorem 



on the Reversion of certain Series 518 



Notices respecting New Books : — 



Dr. E. J. Routh's Treatise on the Dynamics of a System 



of Rigid Bodies 541 



On the Electrical Conductivity of Water distilled in vacuo, by 



Prof. F. Kohlrausch ;. 542 



On the Coefficient of Friction of Gases and Vapours, and 



their Dependence on Temperature, by O. Schumann 544 



