CONTENTS. 



VOL. X. 



PAGE 

 1 



Annual General Meeting 1898, October 31 



Mr A. Berry, On the evaluation of a certain determinant which occurs in 

 the mathematical theory of statistics and in that of elliptic geometry 



of any number of dimensions 



Mr J. H. Grace, (1) Metrical Relations between Linear Complexes. 



(2) Apolar Systems of Quadrics 10 



Mr A. E. Western, Certain Systems of Quadratic Complex Numbers . 10 



Mr H. F. Baker, On Mittag-Leffler's Theorem 10 



Professor J. J. Thomson, On the connection betiveen the Chemical Com- 

 position of a Gas and the Ionization produced in it by Rontgen 



Rays • ■ ' 



Mr J. Zelent, On Convection Currents and on the Fall of Potential at 



the Electrodes, in Conduction produced by Rontgen Rays . . .14 



Mr H. A. Wilson, On Velocity of Solidification . ■ • .25 



z-Mr H. Gadow, Orthogenetic Variation in the Shells of Chelonia . . 35 

 ^Dr A. Willey, Some points in the Morphology of the Enteropneusta . 37 



Mr A. C. Seward and Mr A. W. Hill, On Lepidodendron from the 



Calciferous Sandstone of Scotland .38 



Professor Liveing, On the Flame-spectrum of Mercury, and its bearing 



on the distribution of energy in gases 38 



Professor Liveing, On the Variation of Intensity of the Absorption Bands 

 of different Didymium Salts dissolved in water, and its bearing on the 

 ionization theory of the colour of solutions of salts .... 40 



Professor Dewar, On the Comparative Colour of the Vapour of Iodine in 



Air at Atmospheric Pressure and in Vacuum 44 



Major MacMahon, On the Partitions of Numbers xohich possess sym- 

 metrical Graphs , , • • * • * f 



