vi 



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Data for the Problem of Evolution in Man. II. A First Study of the 

 Inheritance of Longevity and the Selective Death-rate in Man. By 

 Miss Mary Beeton and Karl Pearson, F.R.S., University College, 

 London 290 



Collimator Magnets and the Determination of the Earth's Horizontal 

 Magnetic Force. By C. Chree, Sc.D., LL.D., F.R.S., Superintendent 

 of the Kew Observatory. Communicated by the Kew Observatory 

 Committee of the Eoyal Society , 306 



The Thermal Expansion of Pure Nickel and Cobalt. By A. E. Tutton, 

 B.Sc. Communicated by Professor Tilden, D.Sc, F.R.S 306 



On the Waters of the Salt Lake of Urmi. By R. T. Gunther, M.A., 

 and J. J. Manley, Daubeny Curator, Magdalen College. Communi- 

 cated by Sir John Murray, F.R.S , 312 



On the Application of Fourier's Double Integrals to Optical Problems. 

 By Charles Godfrey, B.A., Scholar of Trinity College, Isaac Newton 

 Student in the University of Cambridge. Communicated by Pro- 

 fessor J. J. Thomson, F.R.S 318 



On Diselectrification Produced by Magnetism. Preliminary Note. By 

 . C. E. S. Phillips. Communicated by Sir William Crookes, F.R.S. .... 320 



On the Orbit of the Part of the Leonid Stream which the Earth 

 encountered on the Morning of 1898, November 15. By Arthur A. 

 Rambaut, M.A., D.Sc, Radcliffe Observer. Communicated by G. 

 Johnstone Stoney, M.A., D.Sc, F.R.S 321 



A Comparison of Platinum and Gas Thermometers, including a Deter- 

 mination of the Boiling Point of Sulphur on the Nitrogen Scale : an 

 Account of Experiments made in the Laboratory, of the Bureau 

 International des Poids et Mesures, at Sevres. By Drs. J. A. 

 Harker and P. Chappuis. Communicated by the Kew Observatory 

 Committee 327 



Agricultural, Botanical, and Chemical Results of Experiments on the 

 Mixed Herbage of Permanent Grasses, conducted for many years in 

 succession on the same Land. Part III. — The Chemical Results. 

 By Sir John Bennett Lawes, Bart., D.C.L., Sc.D., F.R.S., and Sir J. 

 Henry Gilbert, LL.D., Sc.D., F.R.S 329 



No. 420. 



On the Orientation of the Pyramids and Temples in the Sudan. By 

 E. A. Wallis Budge, M.A., Litt.D., D.Lit., F.S.A. Communicated by 

 Professor Sir Norman Lockyer, K.C.B., F.R.S 333 



The Effect of Staleness of the Sexual Cells on the Development of 

 Echinoids. Bv H. M. Vernon, M.A., M.D., Fellow of Magdalen 

 College, Oxford. Communicated by W. F. R. Weldon, F.R.S 350 



On the Influence of the Temperature of Liquid Hydrogen on the 

 Germinative Power of Seeds. By Sir William Thiselton-Dyer, 



K.C.M.G., CLE., F.R.S., Director of the Royal Botanic Gardens, 

 Kew 361 



Effects of Thyroid Feeding on Monkeys. By Walter Edmunds. Com- 

 municated by Professor J. Rose Bradford, F.R.S 368 



