CONTENTS OF VOL. XVII. 



(FIFTH SEEIES). 



NUMBEE CIII.— JANUAEY 1884. 



Page 

 Prof. J. Larmor on Electromagnetic Induction in Conducting 



Sheets and Solid Bodies 1 



Mr. J. W. Clark on the Purification o£ Mercury by Distillation 



in vacuo. (Plate I.) 24 



Mr. E. H. M. Bosanquet on a Standard Tension-Galvanometer. 27 



Prof. Tait on Listing's Topologie. (Plate II.) 30 



Prof. Clausius on the Theory of Dynamo-electrical Machines . 46 

 Mr. F. J.Smith on a new form of -Boiler for the Disk-and-Boller 



Integrator 59 



Prof. J. Tyndall on Eainbows . . . . 61 



Prof. G. Quincke on the Change in the Volumes and Eefractive 



Indices of Fluids produced by Hydrostatic Pressure 65 



Notices respecting New Books : — 



Mr. J. J. Thomson's Treatise on the Motion of Vortex- 



Eings . . . , 69 



Proceedings of the Geological Society : — 



Dr. H. Hicks on the Cambrian Conglomerates resting 



upon and in the vicinity of some Pre-Cambrian Eocks. 71 

 Prof. T. G. Bonney on some Bock-specimens collected 



by Dr. Hicks in Anglesey and N.W. Caernarvonshire . 72 

 Mr. A. J. Jukes-Browne on some Post-glacial Ea vines in 



the Chalk- Wolds of Lincolnshire 73 



A Classification of the Natural Sciences, by Dr. T. Sterry 



Hunt 74 



Determination of Moments of Magnetism by the Balance, by 



H. von Helmholtz 75 



On an Induction Magnetic Compass, by M. Mascart 78 



On Hall's Phenomenon, by M. Aug. Eighi 80 



NUMBEE CIV.— FEBEUAEY. 



Dr. J. CrolTs Examination of Mr. Alfred E. Wallace's Modi- 

 fication of the Physical Theory of Secular Changes of 

 Climate 81 





