CONTENTS OF VOL. XIV. FIFTH SERIES. V 



Page 

 Mr. J. J. Thomson on the Dimensions of a Magnetic Pole in 



the Electrostatic System of Units 225 



Mr. E. J. Smith on a new Form, of Magnetic Torsion-balance 



and Magnetometer 227 



Notices respecting New Books : — 



Dr. G. Lunge's Treatise on the Distillation of Coal-Tar 



and Ammoniacal Liquor 228 



Mr. E. E. Hulme's Worked Examination Questions in 



Plane Geometrical Drawing 230 



On the Duration of the Perception of Light in Direct and In- 

 direct Vision, by Aug. Charpentier 230 



On an Air-Thermometer whose Indications are independent of 



the Barometric Pressure, by Albert A. Michelson 233 



On a Property of the Isentropic Curve for a Perfect Gas 

 as drawn upon the Thermodynamic Surface of Pressure, 



Volume, and Temperature, by Erancis E. Nipher 233 



On the Influence of the Quantity of Gas dissolved in a'Liquid 



upon its Surface-teusion, by S. Wroblewski 236 



On the Structure and Movement of Glaciers, by M. E.-A. Forel. 238 



NUMBEE LXXXVLII.— OCTOBEE. 



Mr. E. H. M. Bosanquet's Notes on Practical Electricity .... 241 



Prof. G. Wiedemann on the Methods employed for determin- 

 ing the Ohm 258 



Mr. L. Fletcher's Crvstallographic Notes 276 



Mr. E. Vansittart Neale on the Tails of Comets 292 



Mr. Silas W. Holman on a Simple Method for Calibrating Ther- 

 mometers 294 



On Boltzmann's Theorem on the average Distribution of 

 Energy in a System of Material Points 299 



Mr. W. Le Conte Stevens's Notes on Physiological Optics . . 312 



Notices respecting New Books : — 



Mr. Latimer Clarke's Treatise on the Transit Instrument 



as applied to the Determination of Time 319 



Geology of Wisconsin. Survey of 1873-79. Vol. in. . . 319 

 Dr. J. H. W. Stuckenberg's Life of Immanuel Kant .... 322 



On the Conservation of Solar Energy, by Pliny Earle Chase, 

 LL.D 322 



On the Appearances of the Electric Arc in the Vapour of Bisul- 

 phide of Carbon, by M. Jamin, with the assistance of M. G. 

 Maneuvrier 324 



On the Electric Resistance of Glass at Low Temperatures, by 

 G. Eoussereau 325 



On the Surface-tension of some Liquids in contact with Car- 

 bonic Acid, bv S. Wroblewski 327 



