CONTENTS op N° 252.— Fifth Series. 



XLI. On the Laws of Irreversible Phenomena. By Dr. Ladislas 

 Natanson, Professor of Natural Philosophy in the University of 

 Cracow page 385 



XLII. A Mechanical Device for Performing the Temperature 

 Corrections of Barometers. By John Shields, D.Sc, Ph.D 406 



XLIII. An Addition to the Wheatstone Bridge for the Deter- 

 mination of Low Eesistances. By J. H. Eeeyes, M.A., City and 

 Guilds of London Central Technical College 414 



XLIV. On the Absorption Spectrum of Solutions of Iodine and 

 Bromine above the Critical Temperature. By E. W. Wood 423 



XLY. The Substitution Groups whose Order is Four. By G. A. 

 Miller, Ph.D 431 



XL VI. On the alleged Scattering of Positive Electricity by Light. 

 By J. Elsteb, and H. Geitel 437 



XL VII. The Tinfoil Grating Detector for Electric "Waves. By T. 

 Mizmsro, Eigakushi, Professor of Physics, Eirst Higher Schools, Tokio 445 



XL VIII. Carbon and Oxygen in the Sun. By John Teowbeilqe 450 



XLIX. On the Effects of Magnetic Stress in Magnetostriction. 

 By H. Nagaoka and E. Tatloe Jones 454 



L. Notices respecting New Books : — Dr. W. M. Watts's Index 

 of Spectra 462 



LI. Intelligence and Miscellaneous Articles : — 



On an Electrochemical Action of the Eontgen Eays on Silver 

 Bromide, by Prof. Dr. Eranz Streinitz 462 



Triangulation by means of the Cathode Photography, by John 

 Trowbridge , 463 



*** It is requested that all Communications for this Work may be addressed, 

 post-paid, to the Care of Messrs. Taylor and Francis, Printing Office, Eed 

 Lion Court, Fleet Street, London. 



