PEOCEEDINGS OF 

 THE ROYAL SOCIETY. 



VOL. LXVI. 



No. 428, 



Meeting of Marcli 1, 1900, and List of Candidates 

 List of Papers read March 1, 1900 . 



CONTENTS. 



220 



221 



Eesearches on Modem Explosives. Second Communication. By W. Macnab, 

 F.I.C., and E. Ristoei, Associate M. Inst., C.E., F.R.A.S. Communi- 

 cated by Professor Ramsay, E.R.S 221 



The Spectrum of a Aquilge. By Sir Nosman Loceyer, K.C.B., E.R.S., 



and A. Fowler (Plate 1) 232 



The "Velocity of the Ions produced in G-ases by Rontgen Rays. By John 

 Zeleny, B.Sc, B.A., Assistant Professor of Physics, University of 

 Minnesota. Communicated by Professor J". J. Thomson, F.R.S. . . 238 



Mathematical Contributions to the Theory of Evolution. VIII. On the 

 Correlation of Characters not Quantitatively Measurable. By Karl 

 Pearson, F.R.S 241 



Meeting of March 8, 19C0 244 



Bakeeian Lecture. — On the Specific Heat of Metals and the Relation of 

 Specific Heat to Atomic V^eiglit. By W. A. Tilden, D.Sc, F.R.S., 

 Professor of Chemistry in the Royal College of Science, London. With 

 an Appendix by Professor John Peery, F.R.S 244 



Meeting of March 15, 1900, and List of Papers read 247 



Total Eclipse of the Sun, January 22, 1898. Observations at Viziadrug. 

 By Sir Noeman Lockyee, K.C.E., F.R.S.^ Captain Chishol3I -Batten, 

 R.N., and Professor A, Pedlee, F.R.S 247 



A Comparative Crystallographical Study of the Double Selenates of the 

 Series R2M(Se04)2,6H20.— Part I. Salts in which M is Zinc. By A. E. 

 TuTTON, B.Sc, F.R.S . 248 



An Experimental Inquiry into Scurvy. By Feedeeick Gr. Jackson and 



Vattghan Harley, M.D. Communicated by Lord Lister, P.R.S. . 250 



The Theory of the Double Gamma Function. By E. W. Barnes, B.A., 

 Fellow of Trinity College, Cambridge. Communicated by Professor A. 



R. FoESTTH, Sc.D., F.R.S 265 



Price Two Shillings. 



April 14, 1900. 



