[ 
489 
] 
INDEX 
TO THE 
PHILOSOPHICAL TRANSACTIONS. 
Series A, Vol. 216. 
A. 
Abney (Sir W. de W.) ancl Watson (W.). Tlie Threshold of Vision for Different Coloured Lig-lits, 91. 
B. 
Baker (H. IT.). On certain Linear Differential Equations of Astronomical Interest, 129. 
Bust (P. P.) and Ed&ar (E. C.). The Combining Volumes of Hydrogen and Oxygen, 393. 
C. 
Chapman (S.). On the Law of Distribution of Molecular Velocities, and on the Theory of Viscosity and Thermal 
Conduction, in a Non-uniform Simple Monatomic Gas, 279. 
Cheek (C.). Discussion of Kew Magnetic Data, especially the Diurnal Inequalities of Horizontal Force and Vertical Force 
from Ordinary Days of the Eleven Years 1890 to 1900, 187. 
Coloured lights, threshold of vision for (Abney and Watson), 91. 
D. 
Differential equations of astronomical interest, on certain linear (Bakee), 129. 
E. 
Ed&ar (E. C.). See Burt and Ed&ab. 
Evolution, mathematical contributions to the theory of (Pearson), 429. 
F. 
Flames containing salt vapours, electrical conductivity and luminosity of (Wilson), 63. 
Gr. 
Gravitation, Newtonian constant of, as affected by temperature (Shaw), 349. 
VOL. CCXVI.-A. 3 X [Published July 3, 1916. 
V 
r 
