Some Observations on the Amount of Luminous and Non-luminous 



Kadiation emitted by a Gas Flame. By Sir John Conroy, Bart., M. A. 41 



On the Effects of Pressure on the Magnetisation of Cobalt. By C. Chree, 



M.A., Fellow of King's College, Cambridge 41 



On the Steam Calorimeter. By J. Joly, M.A , 45 



On the Extension and Flexure of Cylindrical and Spherical Thin Elastic 



' Shells. By A. B. Basset, M.A., F.RS 45 



List of Presents 49 



Some Observations on the Amount of Luminous and Non-Luminous 

 Radiation emitted by a Gas Flame. By Sir John Conroy, Bart., M. A., 

 Bedford Lecturer of Balliol College and Millard Lecturer of Trinity 

 College, Oxford 55 



No. 287. 



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

 1-5) 67 



January 9, 1890. 



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

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

 Professor J. H. Gilbert, LL.D., F.RS 85 



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 



A Milk Dentition in Orycteropus. By Oldfield Thomas, Natural History 

 Museum : 126 



List of Presents 126 



January 16, 1890. 



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

 Lockyer, F.RS 129 



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

 Bobson, F.RC.S 129 



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



List of Presents 13 



January 23, 1890. 



On a Photographic Method for determining Variability in Stars. By 

 Isaac Roberts, F.RA.S \. 137 



Physical Properties of Nickel Steel. By J. Hopkinson, D.Sc, F.RS 138 



List of Presents 140 



