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Total Eclipse of the Sun, 1901, May 18. Preliminary Account of the 

 Observations made at Pulo Aoer Gadang, West Coast of Sumatra. 

 By F. W. Dyson, M.A., F.R.S., Sec. RA.S 235 



Total Eclipse of the Sun, 1901, May 18. Preliminary Account of the 

 Observations made at the Royal Alfred Observatory, Pample- 

 mousses, Mauritius. By E. Walter Maunder, F.R.A.S 247 



Preliminary Note on Observations of the Total Solar Eclipse of 1901, 

 May 18, made at Pamplemousses, Mauritius. By (Mrs.) A. S. D. 

 Maunder ... 261 



No. 455. 

 Anniversary Meeting and Meeting of December 5, 1901 267 



The Development of Echinus esculentus. By E. W. MacBride, M.A., 

 D.Sc., Professor of Zoology in McGill University, Montreal. Com- 

 municated by Adam Sedgwick, F.R.S ~. 268 



On the Spontaneous lojnisation of Gases. By C. T. R. Wilson, M.A., 

 F.R.S., Fellow of Sidney Sussex College, Cambridge 277 



Notes on Quantitative Spectra of Beryllium. By W. N. Hartley, D.Sc., 

 F.R.S., Royal College of Science, Dublin 283 



Preliminary Account of the Prothallium of Phylloglossum. By A. P. W. 

 Thomas, M.A., F.L.S., University College, Auckland, N.Z. Com- 

 municated by Professor G. B. Howes, F.R.S 285 



Notes on the Development of Paludina vivipara, with Special Reference 

 to the Urinogenital Organs and Theories of Gasteropod Torsion. 

 (Preliminary Note.) By Isabella M. Drummond. Communicated 

 by Professor W. F. R. Weldon, F.R.S 291 



On the Intimate Structure of Crystals. Part V. Cubic Crystals with 

 Octahedral Cleavage. By W. J. Sollas, D.Sc., LL.D., F.R.S., Pro- 

 fessor of Geology in the University of Oxford 294 



Meeting of December 12, 1901, and List of Papers read 307 



Contributions to the Chemistry of Chlorophyll. No. VIII. Changes 

 undergone by Chlorophyll in passing through the Bodies of Animals. 

 By Edward Schunck, F.R.S .T 307 



The Effective Temperature of the Sun. By W. E. Wilson, D.Sc., 

 F.R.S 312 



On the Constitution of Copper-Tin Alloys. By C. T. Heycock, F.R.S., 

 and F. H. Neville, F.R.S 320 



No. 456. 

 Meeting of January 23, 1902, and List of Papers read 330 



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

 Influence of Natural Selection on the Variability and Correlation 

 of Organs. By Karl Pearson, F.R.S., University College, London .... 330 



