IV 



Page 



On the Influence of certain Natural Agents on the Virulence of the 

 Tubercle-Bacillus. By Arthur Ransome, M.D., F.R.S., and Sheridan 

 Delepine 51 



On some Voltaic Combinations with a Fused Electrolyte and a Gaseous 

 Depolariser. By J. W. Swan, M.A 56 



Measurements of the Absolute Specific Resistance of Pure Electrolytic 

 Copper. By J. W. Swan and J. Ehodin 64 



List of Presents . 81 



May 31, 1894. 



On the Electrification of Air. By Lord Kelvin, P.E.S., and Magnus 

 Maclean, M.A., F.RS.E 84 



On the Effect of Magnetisation upon the Dimensions of Iron Rings in 

 Directions perpendicular to the Magnetisation, and upon the Volume 

 of the Rings. By Shelford Bidwell, M.A., LL.B., F.R.S 94 



Note on the Possibility of obtaining a Unidirectional Current to Earth 

 from the Mains of an Alternating Current System. By Major P. 

 Cardew 99 



The Effect of Mechanical Stress and of Magnetisation on the Physical 

 Properties of Alloys of Iron and Nickel and of Manganese Steel. By 

 Herbert Tomlinson, B.A., F.R.S 103 



Propagation of Magnetisation of Iron as affected by the Electric 

 Currents in the Iron. By J. Hopkinson, F.R.S., and E. Wilson 108 



On Rapid Variations of Atmospheric Temperature, especially during 

 Fohn, and the Methods of observing them. By J. Y. Buchanan, 

 F.R.S 108 



The Root of Lyginodendron Oldhamium, Will. By W. C. Williamson, 

 LL.D., F.R.S., and D. H. Scott, M.A., Ph.D., F.L.S., F.G.S 128 



List of Presents ., 128 



No. 337. June 7, 1894. 

 Election of Fellows 130 



On the Newtonian Constant of Gravitation. By C. V. Boys, F.R.S., 

 A.R.S.M., Assistant Professor of Physics, Royal College of Science, 

 South Kensington 131 



On the Recurrent Images following Visual Impressions. By Shelford 

 Bidwell, M.A., LL.B., F.R.S , 132 



Niagara Falls as a Chronometer of Geological Time. By J. W. Spencer, 

 Ph.D 145 



The Influence of Intra-Venous Injection of Sugar on the Gases of the 

 Blood. By Vaughan Harley, M.D., Teacher of Chemical Pathology, 

 University College, London, Grocer Research Scholar 148 



Contributions to the Life-History of the Foraminifera. By J. J. Lister, 

 M.A., St. John's College, Cambridge 155 



List of Presents .. 160 



