PROCEEDINGS OF 

 THE ROYAL SOCIETY. 



VOL. LXV. 



No. 419. 



CONTENTS. 



CE LIBRARY j 



j* 



PAGE 



The Colour Sensations in Terms of Luminosity. By Captain W. de W. 



Abney, C.B., D.C.L., F.R.S 282 



The Conductivity of Heat Insulators. By C. G. Lamb, M.A., B.Sc, and 



W. G. Wilson, B.A. Communicated by Professor Ewing, F.R.S. . 283 



On the Orientation of Greek Temples, being the Results of some Observations 

 taken in Greece .and Sicily, in May, 1898. By F. C. Penrose, M.A., 

 F.R.S .288 



On the Comparative Efficiency as Condensation Nuclei of positively and nega- 

 tively charged Ions. By C. T. R. Wilson, M.A. Communicated by the 

 Mete oeo logical Council 289 



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

 tance 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 Mag- 

 netic Force. By C. Chree, Sc.D., LL.D., F.R.S., Superintendent of the 

 Kcw Observatory. Communicated by the Kew Observatory Com- 

 mittee of the Royal 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 Ormi. By R. T. Gunther, M.A., and 

 J. J. Manley, Daubeny Curator, Magdalen College. Communicated 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 Professor 



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



For continuation of Contents see 2nd page of Wrapper. 



Price Two Shillings. 



Octobef 7, 1899. 



