848 
INDEX. 
Darwin (G. EL). On the Precession of a Viscous Spheroid, and on the remote History of the Earth, 447. 
—Part I. Tidal forces and tidal distortion of the spheroid, 449; couples caused by the moon’s attrac¬ 
tion, 455; motion of the earth about its centre of inertia, 459; precession and change of obliquity, 462; 
disturbing action of the sun, 465; rate of change of obliquity, &c., due to both sun and moon, 468; 
secular acceleration of the moon, 475.—Part. II. Integration of the differential equations for secular 
changes in the variables in the case of viscosity, 485; loss of energy of the system, 494; initial con¬ 
dition of the earth and moon, 507; change in the length of the year, 511; change of obliquity, &c., 
due to an annular satellite, 518 ; double tidal reaction, 519; secular contraction of the earth, 521._ 
Part III. Summary and discussion of the results, 523. 
Darwin (G. H.). Problems connected with the Tides of a Viscous Spheroid, 539 (for contents see p. 539)- 
Double refraction , experimental examination of, in arragonite, 287 (see Glazebrooe). 
E. 
Earth , remote history of, 447 (see Darwin). 
Electrical discharges through rarefied gases, sensitive state of, 165 (see Spottiswoode). 
Electrodynamic qualities of metals, 55 (see Thomson). 
Ellipsoids, potentials of, 403. 
F. 
Fatty acids, absorption of ultra-violet rays by, 263. 
G. 
Gas, stresses in rarified, arising from inequalities of temperature, 231 (see Maxwell) ; 772 (see Reynolds) ; 
dimensional pi’operties of matter in the state of, 727 (see Reynolds). 
Glazebrook (R. T.). An Experimental Determination of the Values of the Velocities of Normal 
Propagation of Plane Waves in different directions in a Biaxal Crystal, and a Comparison of the 
Results with Theory, 287.—Outline of method, and review of previous experiments, 287; descrip¬ 
tion of apparatus, &c., 292; results, 300, 305 ; values of principal indices, and angle between optic 
axes, 307 ; comparison of experiments with theories of Fresnel and Lord Rayleigh, 310 ; results for 
a second prism compared with theory, 323; description of a second crystal and comparison with 
theory of results obtained with it, 331; principal indices, 344; general results of the investigation, 
375; effect of dispersion, 376. 
Gordon (J. E. H.). Measurements of Electrical Constants.—No. II. On the Specific Inductive Capacity 
of Certain Dielectrics.—Part I., 417 (for contents see p. 417). 
H. 
Hannay (J. B.). On the Microrheometer, 275. 
Hartley (W. N.) and Huntington (A. X.). Researches on the Action of Organic Substances on the 
Ultra-violet Rays of the Spectrum, 257.—Part I. Method of Experimenting, Examination of Alcohols 
and Fatty Acids, 257.—Part II. Examination of Substances containing the Benzene Nucleus, 268. 
Huntington (A. K.) and Hartley (W. N.)., 257 (see Hartley). 
