PROCEEDINGS OF 

 THE ROYAL SOCIETY. 



VOL. LXXI. No. 470. 



CONTENTS. 



PAGE 



An Experimental Determination of the Variation of the Critical Velocity of 

 Water with Temperature. By E. G-. Coker, M.A. (Cantab.), D.Sc. 

 (Edin.), Assistant Professor of Civil Engineering, and S. B. Clement, 

 B.Sc, Demonstrator of Civil Engineering, both of McGrill University, 

 Montreal. Communicated by Professor Osborne Reynolds, F.R.S. . 152 



Isomeric Change in Benzene Derivatives. — The Interchange of Halogen and 

 Hydroxyl in Benzenediazonium Hydroxides. By K. J. P. Orton, 

 Ph.D., M.A., St. John's College, Cambridge, Demonstrator of Chemistry, 

 St. Bartholomew's Hospital. Communicated by Professor H. E. Arm- 

 strong, F.R.S. 153 



On certain Properties of the Alloys of the Gold-Silver Series. By the late 

 Sir W. C. Roberts-Austen, K.C.B., D.C.L., F.R.S., and T. Kirke 

 Rose, D.Sc. (Plate 3) 161 



Abnormal Changes in some Lines in the Spectrum of Lithium. By HrrOH 

 Ramage, B.A., St. John's College, Cambridge. Communicated by Pro- 

 fessor G-. D. Liyeing, F.R.S 164 



An Error in the Estimation of the Specific G-ravity of the Blood by Ham- 

 merschlag's Method, when employed in connection with Hydrometers. 

 By A. GL Levy, M.D. (London). Communicated by Sir Victor 

 Horslet, F.R.S 171 



Quaternions and Projective G-eometry. By Charles J. Jolt, F.T.G.D., 

 Royal Astronomer of Ireland. Communicated by Sir Robert S. Ball, 

 F.R.S 177 



The Stability of the Pear-shaped Figure of Equilibrium of a Rotating Mass 

 of Liquid. By GL H. Darwin, F.R.S., Plumian Professor and Fellow 

 of Trinity College, in the University of Cambridge . . . 178 



Minutes of Meeting of December 11, 1902 vi 



Price One 



January 16, 1903. 



Sixpence. 



