[ iv ] 
VI. On the Heat Dissipated Ijy a Platinum Surface at High Temperatures. 
Part IV. Thermal Emissivity in High-pressii7'e Gases. By J. E. Petayel, 
A.M. Inst. C.E., A.M. Inst. E.E., Past 1851 Exhibition Scholar, John 
llarling Eellow of the Owens College, Manchester. Communicated, by Arthur 
Schuster, F.R.S . page 229 
VII. A Comparative CrystaUographicad, Study of the Double Selenates of the Series 
IloM(SeOj^)o, 6 ll 30 .— Part II. Salts in ivhich M is Magnesium. By A. E. 
Tutton, B. Sc., F.R.S. .255 
VIII. Mathematical Contributions to the Theory of Evolution. —IX. On the Principle 
of Homotyposis aiid its Relation to Hei'edity, to the Variability of the 
Individual, and to that of the Race. Part I.— Homotyposis in the Vegetable 
Kingdom. By Karl Pearson, F.R.S., with the assistance of Alice Lee, 
D.Sc., Ernest Warren, D.Sc., Agnes Fry, Cicely D. FA^YCETT, B.Sc., and 
others . 285 
IX. Wave-le7igth Determmations and General Residts obtained from a Detailed 
Examinatio7i of Spectra photogyxiphed at the Solar Eclipse of January 22, 
1898. By John Evershed, F.R.A.S. Commwiicoled by Dr. A. A. Rambaut, 
F.R.S. . 381 
X. On the Electrical Conductivity of Air cmd. Salt Vapours. By Harold A. 
Wilson, D.Sc., M.Sc., B.A., Allen Scholar, Cavendish Laboratory, Cam¬ 
bridge. Communicated by Professor I. I. F.R.S. . . . . 415 
XL Mathematical Contributions to the Theory of Evolution. —X. Supplement to a 
Memoir 07i Skew Variation. By Karl Pearson, F.R.S., University College, 
Bond 071 . 443 
XII. Ellipsoidal Harmoyiic Analysis. By G. H. Darwin, F.R.S., Plumian 
Professor and Fellow of Trmity College, in the University of Cannbridge 461 
Index to Vohmie 
559 
