[ Hi ] 
CONTENTS. 
(A) 
VOL. 200. 
List of Illustrations . . . .page v 
Advertisement. vii 
I. Mathematical Contributions to the Theory of Evolution .—XL On the Injliience of 
Natural Selection on the Variahility and Correlation of Organs. By Karl 
Pearson, F.R.S., University College, London . page 1 
II. On tlie Equilibrium of Rotating Liquid Cylinders. By J. H. Jeans, B.A., Isaac 
Newton Student and Eellow of Trinity College, Cambridge. Communicated 
by Professor G. H. Darwin, E.R.S .67 
III. On the Measurement of Temperature. Bart I.— On the Pressure Coefficients of 
Hydrogen and Helium at Constant Volume and at different Initird Pressures. 
Part II.— 0)1 the Vapour Pressures of Liquid Oxygen cut Temperatures below 
its Boiling-Point on the Constant-Volume Hydrogen and Helium SccUes. 
Part III.— On the Vapour Pressures of Liquid Hydrogen at Temperatures 
below its Boiling-Point on the Constant-Volume Hydrogen cmd Helium Sccdcs. 
By Morris W. Travers, D.Sc., Felloiv of University College, London, 
George Senter, B.Sc., and Adrien Jaquerod, D.Sc. CornmunicaMd by 
Professor William Ramsay, E.R.S. . 105 
IV. On some Definite Integrals, and a New Method of Reducing a Function of 
Spl lerical Co-ordinates to a Series of Sqjher'ical Harmonics. By Arthur 
Schuster, E.R.S. . .181 
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