754 
INDEX. 
Cayley (A.). On the Bicircular Quartic. — Addition to Professor Casey’s Memoir “On a new Form 
of Tangential Equation/’ 441 . 
‘ Challenger ’ Expedition, biological observations made during, 117 (see Moseley). 
Chemical operations, calculus of, 35 (see Brodie). 
China, magnetic dip in, 137 (see Shadwell). 
Coal-measures, fossil plants of tbe, 213 (see Williamson). 
Cycloid, 406 (see Casey). 
D. 
Darwin (G. H.). On the Influence of Geological Changes on the Earth’s Axis of Rotation, 271. — 
Precession of a spheroid slowly changing its shape, 272 ; the principal axes of the earth, 287 ; 
forms of continents and seas which produce the maximum deflection of the polar axis, 290 ; on geo- 
logical changes of the earth’s surface, 293 ; numerical application to the case of the earth, 297 ; 
hypotheses of internal changes of density accompanying elevation and subsidence, 299 ; summary 
and conclusion, 303 ; appendices, 305. 
Day (R. E.) and Adams (W. G.) (see Adams). 
E. 
Earth’s axis of rotation, influence of geological changes on, 271 (see Darwin). 
Epicycloids, 415 (see Casey). 
Erythrophleum guinense, physiological action of, 627 (see Brunton). 
F. 
Fossil plants of Coal-measures, 213 (see Williamson). 
Friction between surfaces moving at low speeds, 509 (see J enkin) . 
G. 
Geological changes of the earth, influence of, on the earth’s axis of rotation, 271 (see Darwin). 
Germs of Bacteria &c., 149 (see Tyndall). 
Glasses, dielectric properties of, 509 (see Hopkinson). 
Gordon (J. E. H.). On the determination of Verdet’s constant in absolute units, 1 (for Contents 
see p. 1). 
H. 
Hopkinson (J.). Residual Charge of the Leyden Jar. — Dielectric properties of different glasses, 509; 
effect of temperature, 615. 
Hyperjacobian surfaces and curves, 351 (see Spottiswoode). 
Hypocycloids, 420 (see Casey). 
I. 
Inequality of 306-days period in earth’s rotation, 278. 
Intrinsic equation of a curve, 379 (see Casey). 
Involutes, 393 (see Casey). 
