IV 



February 2, 1905. 

 Sir WILLIAM MUGGINS, K.C.B., O.M., President, in the Chair. 



A List of the Presents was laid on the table, and thanks ordered for 

 them. 



The following Papers were read : 



I. " On the Compressibility of Gases between One Atmosphere and 

 Half an Atmosphere of Pressure." By LORD EAYLEIGH 

 O.M., F.E.S. 



II. 

 III. 



IV. 



V. " 

 VI. " 



On the ' Blaze Currents ' of the Gall Bladder of the Frog." 

 By Mrs. A. M. WALLER. Communicated by Dr, A. D. 

 WALLER, F.E.S. 



; The Theory of Photographic Processes : On the Chemical 

 Dynamics of Development." By S. E. SHEPPARD and 

 C. E. K. MEES. Communicated by Sir WILLIAM EAMSAY, 

 K.C.B., F.E.S. 



On the Eelation between Variations of Atmospheric Pressure 

 in North-East Africa and the Nile Flood." By Captain 

 H. G. LYONS. Communicated by Dr. W. N. SHAW, F.E.S. 



Note on the Determination of the Volume Elasticity of Elastic- 

 Solids." By Dr. C. CHREE, F.E.S. 



Theory of the Eeflection of Light near the Polarizing Angle." 

 By Professor E. C. MACLAURIN. Communicated by Professor 

 J. L ARMOR, Secretary, E.S. 



VII. "On a Eelation between Autumnal Eainfall and the Yield of 

 Wheat of the Following Year." By Dr. W. N. SHAW, F.E.S. 



February 9, 1905. 

 Sir WILLIAM HUGGINS, K.C.B., O.M., President, in the Chair. 



A^ist of the Presents was laid on the table, and thanks ordered for 

 them. 



The following Papers were read : 



I " On the Conversion of Electric Oscillations into Continuous 

 Currents by means of a Vacuum Valve." By Professor 

 J. A. FLEMING, F.E.S. 



