CONTENTS. 



VOL. XLVI. 



No. 280.— May 2, 1889. 



Page 



Note on the Effect produced by Conductors in the Neighbourhood of a 

 Wire on the Rate of Propagation of Electrical Disturbances along it, 

 with a Determination of this Rate. By J. J. Thomson, M.A., F.R.S., 

 Cavendish Professor of Experimental Physics, Cambridge 1 



Researches in the Chemistry of Selenic Acid and other Selenium Com- 

 pounds. By Sir Charles A. Cameron, M.D., F.R.C.S.L, V.P.I.C., 

 Professor of Chemistry and Hygiene, R.C.S.I., and John Macallan, 

 F.I.C., Demonstrator of Chemistry, R. C.S.I 13 



On the Wave-length of the chief Fluting seen in the Spectrum of Man- 

 ganese. By J. Norman Lockyer, F.R.S 35 



The Accurate Determination of Carbonic Acid and Moisture in Air. By 

 J. S. Haldane, M.A., M.B., and M'.. S. Pembrey, Pell Exhibitioner of 

 Christ Church, Oxford. (From the Physiological Laboratory, Oxford) 40 



On the Spectrum, Visible and Photographic, of the Great Nebula in 

 Orion. By William Huggins, D.C.L., LL.D., F.R.S., and Mrs. Huggins 



(Plate 1) , 40 



List of Presents 61 



May 9, 1889. 



On the Magnetic Rotation of the Plane of Polarisation of Light in doubly 

 refracting Bodies. By A. W. Ward 65 



Revision of the Atomic Weight of Gold. By J. W. Mallet, F.R.S., Pro- 

 fessor of Chemistry in the University of Virginia .„ 71 



Zirconium and its Atomic Weight. By G. H. Bailey, D.Sc, Ph.D., The 

 Owens College 74 



Magnetic and other Physical Properties of Iron at a High Temperature. 

 By J. Hopkinson, F.R.S 87 



Determining the Strength of Liquids by means of the Voltaic Balance. 

 By G. Gore, LL.D., F.R.S 87 



On Films produced by Vaporised Metals and their Applications to 

 Chemical Analysis. (Preliminary Notice.) By W. N. Hartley, F.R.S., 

 Royal College of Science, Dublin 88 



List of Presents , 90 



