CONTENTS OF VOL. XLI. — FIFTH SERIES. 



NUMBEB CCL.— MAECH. 



Page 



Dr. E. Taylor Jones on Magnetic Tractive Eorce 153 



Dr. Alfred M. Mayer's Besearches in Acoustics. — No. X. . . 168 

 Profs. W. Nernst and B. Abegg on the Ereezing-points of 



Dilute Solutions 196 



Prof. J. D. Everett on Eesultant Tones 199 



Prof. E. Y. Edgeworth on the Compound Law of Error .... 207 



Mr. E. S. Cole on Graphical Methods for Lenses 216 



J. Elster and H. Geitel's Electro-optical Investigation of 



Polarized Light . 218 



Aug. Eighi on the Production of Electrical Phenomena by 



the Eontgen Eays 230 



Notices respecting New Books : — 



Prof. Thompson's Dynamo-Electric Machinery. ....... 234 



Prof. Carey Poster and Dr. Atkinson's Elementary 

 Treatise on Electricity and Magnetism, founded on 



Joubert's ' Traite Elementaire d'Electricite ' 234 



Prof. Holman's Computation Eules and Logarithms, with 



tables of other useful functions 235 



Black Light, by M. Gustave Le Bon 235 



NUMBER CCLI.— APEIL. 



Prof. Svante Arrhenius on the Influence of Carbonic Acid 

 in the Air upon the Temperature of the Ground 237 



Prof. J. G. MacGregor on the Calculation of the Conductivity 

 of Mixtures of Electrolytes 276 



Prof . A. W. Witkowski on the Thermodynamic Properties of 

 Air. (Plates I. & II.) 288 



Prof. J. A. Eleming and Mr. J. E. Petavel's Analytical Study 

 of the Alternating Current Arc 315 



Prof. W. Eamsay and Mr. N. Eumorfopoulos on the De- 

 termination of High Temperatures with the Meldometer . 360 



Mr. W. H. Everett on the Magnetic Eield of any Cylin- 

 drical Coil . . /. 367 



Prof. Arthur L. Clark on a Method of Determining the Angle 

 of Lag 369 



Prof. E. L. O. Wadsworth on Mr. Burch's Method of Draw- 

 ing Hyperbolas 372 



Mr. E. W. Wood on a Duplex Mercurial Air-Pump 378 



Notes of Observations on the Eontgen Eays, by H. A. Bow- 

 land, N. B. Carmichael, and L. J. Briggs 381 



Note on u Eocus Tubes " for producing X-rays, by E.W.Wood 382 



