CONTENTS OF VOL. III. FIFTH SERIES. 



NUMBER XVII.— MARCH. 



Prof. G. Wiedemann on the Laws of the Passage of Electricity- 

 through G-ases 161 



Mr. G. H. Darwin on a suggested Explanation of the Obli- 

 quity of Planets to their Orbits 188 



Dr. E. Bouty on the Magnetization of Steel by Currents .... 192 

 Prof. P. E. Chase on the Nebular Hypothesis. — V. ^Ethereal 



Nodes 203 



Mr. O. Heaviside on the Speed of Signalling through Hetero- 

 geneous Telegraph Circuits 211 



Captain xAbuey on Fixed Lines in the Ultra-red Region of the 



Spectrum 222 



Notices respecting New Books : — 



Prof. A. Cayley's Elementary Treatise on Elliptic Func- 

 tions 223 



Mr. B. Williamson's Elementary Treatise on the Differ- 

 ential Calculus, containing the Theory of Plane Curves, 



with numerous examples 227 



Proceedings of the Royal Society : — 



Prof. J. Thomson on the Origin of Windings of Rivers in 

 Alluvial Plains, with Remarks on the Plow of Water 



round Bends in Pipes 228 



Mr. W. Crookes on Repulsion resulting from Radiation. 



Influence of the Residual Gas 231 



Proceedings of the Geological Society: — \ 



Mr. H. F. Blanford on the Origin, Glacial or Volcanic, of 

 the Talchir Boulder-bed of India and the Karoo Boul- 

 der-bed of South Africa 235 



Mr. J. A. Phillips on the Chemical and Mineralogical 

 Changes which have taken place in certain Eruptive 



Rocks of North Wales 235 



On the Determination of the Polar Distance in Magnets, by 



R. Benoit 236 



Photographs of the Spectra of Venus and a Lyrse, by Professor 



H. Draper ' 238 



On the Spectra of Metals at the Base of Flames, by M. Gouy. 238 



NUMBER XVIII.— APRIL. 



Prof. C. Niven on the Theory of an Imperfectly Homogeneous 



Elastic Solid 241 



Prof. G. C. Foster on the Polarization of Heat 261 



Mr. J. Ennis on the Physical and Mathematical Principles 



of the Nebular Theory 262 



Mr. R. H. M. Bosanquet on the Theory of Sound 271 



Prof. Challis on a Theory of the Action of the Cup-shaped 

 Radiometer with both sides bright 278 



