PROCEEDINGS OF 

 THE ROYAL SOCIETY. 



vol. lxviii. No. 447. 



CONTENTS. 



PAGE 



On the Variation in G-radation of a Developed Photographic Image when 

 impressed by Monochromatic Light of Different Wave-lengths. By 

 Sir William de W. Abney, K.C.B., D.C.L., D.Sc, F.E.S. . . . 300 



A Comparative Crystallographical Study of the Double Selenates of the 

 Series E 2 M(Se0 4 )2,6H 2 0— Salts in which M is Magnesium. By A. E. 

 Ttttton, B.Sc, F.E.S . .322 



On the Presence of a Glycolytic Enzyme in Muscle. By Sir T. Lauder 



Brttnton, M.D., F.E.S., and Herbert Ehodes, M.B 323 



Annual Meeting for the Election of Fellows 326 



Meeting of June 6, 1901, and List of Papers read 327 



Vibrations of Eifle Barrels. By A. Mallock. Communicated by Lord 



Eayleigh, F.E.S 327 



A Conjugating " Yeast." By B. T. P. Barker, B.A., G-onville and Caius 

 College, Cambridge. Communicated by Professor Marshall Ward, 

 F.E.S 345 



The Measurement of Magnetic Hysteresis. By GS-. P. C. Searle, M.A., and 

 T. G. Bedeord, M.A. Communicated by Professor J. J. Thomson, 

 F.E.S 348 



Thermal Adjustment and Eespiratory Exchange in Monotremes and Mar- 

 supials. — A Study in the Development of Homothermism. By C. J. 

 Martin, M.B., D.Sc, Acting Professor of Physiology in the University 

 of Melbourne. Communicated by Professor E. H. Starling-, F.E.S. . 352 



On the Elastic Equilibrium of Circular Cylinders under certain Practical 

 Systems of Load. By L. N. G-. Filon, M.A., B.Sc, Eesearch Student 

 of King's College, Cambridge ; Fellow of University College, London ; 

 1851 Exhibition Science Eesearch Scholar. Communicated by Pro- 

 fessor Ewing, F.E.S 353 



The Measurement of Ionic Velocities in Aqueous Solution, and the Existence 

 of Complex Ions. By B. D. Steele, B.Sc, 1851 Exhibition Scholar 

 (Melbourne). Communicated by Professor Eamsay, F.E.S. . . . 358 



Price Two Shillings. ^^ffiw mst/ty ? 

 July 9, 1901. ft I 22 \%P 



