PROCEEDINGS OF 

 THE ROYAL SOCIETY. 



I APR 17 1890 J 



PAGE 



Observations on the Spark Discharge. By J. Joly, M.A., B.E. (Plates 1 — 5) 1 



January 9, 1890. 



I. New Experiments on the question of the Fixation of Free Nitrogen. 

 (Preliminary Notice.) By Sir J. B. Lawes, Bart., LL.D., F.R.S., and 

 Professor J. H. Gilbert, LL*.D., F.R.S 85 



II. On Electric Discharge between Electrodes at different Temperatures in 

 Air and in High Vacua. By J. A. Fleming, M.A., D.Sc, Professor of 

 Electrical Engineering in University College, London .... 118 



III. A Milk Dentition in Orycteropus. By Oldeield Thomas, Natural History 



Museum 126 



List of Presents ' 126 



January 16, 1890. 



I. On the chief Line in the Spectrum of the Nebulae. By J. Norman 



Lockyer, F.R.S 129 



II. Observations regarding the Excretion and Uses of Bile. By A. W. Mayo 



Robson, F.R.C.S. ... ...... 129 



III. The Theory of Free Stream Lines. By J. H. Michell, Trin. Coll. Cam. 129 



List of Presents 133 



January 23, 1890. 



I. On a Photographic Method for determining Variability in Stars. By 



Isaac Roberts, F.R.A.S 137 



II. Physical Properties of Nickel Steel. By J. Hopkinson, DSc, F.R.S. . 138- 



List of Presents ... . 140 



Tor continuation of Contents see 2nd page of Wrapper. 



Ponce Five Shillings and Sixpence. 

 March 31, 1890. 



