CONTENTS OF VOL. I. SIXTH SERIES. V 



NUMBER IV.— APRIL. 



Page 

 Prof. J. J. Thomson on a kind of easily Absorbed Radiation 

 produced by the Impact of slowly moving Cathode Rays ; 

 together with a Theory of the Negative Glow, the Dark 



Space, and the Positive Column 361 



Dr. E. A. Lehfeldt on Electromotive Force and Osmotic 



Pressure 377 



Dr. E. A. Lehfeldt on the Graphical Treatment of Experi- 

 mental Curves 403 



Prof. E. W. Wood on the Anomalous Dispersion of Carbon . 405 

 Dr. Morris W. Travers on the Liquefaction of Hydrogen. 



(Plate V.) * 411 



Prof. A. W. Eiicker on the Magnetic Field produced by Elec- 

 tric Tramways 423 



Dr. E. T. Glazebrook on the Practical Application of the 



Theory of Magnetic Disturbance by Earth-Currents .... 432 

 Dr. J. C. Beattie on Leakage of Electricity from Charged 



Bodies at Moderate Temperatures 442 



Mr. J. B. B. Burke on the Phosphorescent Glow in Gases . . 455 

 Prof. D. B. Brace : Observation of the Resolution of Light 



into its Circular Components in the Faraday "Effect " .... 464 

 Prof. A. Smithells on the Spectra of Carbon Compounds .... 476 

 Dr. R. S. Willows on the Absorption of Gas in a Crookes 



Tube 503 



Notices respecting New Books : — 



Annuaire pour l'an 1901, publie par le Bureau des Longi- 

 tudes 517 



The Electro-Chemist and Metallurgist 517 



G. Rudorf's The Periodic Classification and the Problem 



of Chemical Evolution 517 



Meldola's Inorganic Chemistry, revised by J. C. Evans. . 518 



C. C. Hawkins's Theory of Commutation . . . « 519 



W. von Bezold's Theoretische Betrachtungen iiber die 



Ergebnisse der Wissenschaftlichen Luftfahrten .... 519 

 Memoires Originaux sur la Circulation Ge'nerale de 



1' Atmosphere 519 



Die Erdstrome im Deutschen Reichstelegraphengebiet 

 und ihr Zusammenhang mit den Erdmagnetischen 



Erscheinungen 520 



Proceedings of the Geological Society 520 



NUMBER V.— MAT. 



Mr. J. H. Jeans on the Striated Electrical Discharge 521 



Dr. A. F. Zahm on the Resistance of the Air at Speeds below 



One Thousand Feet a Second 530 



Prof. Emilio Yillari : How Air subjected to X-rays loses its 



Discharging Property, and how it produces Electricity . . 535 



