894 
INDEX. 
F. 
Ferns in coal-measures, 505 (see Williamson). 
Fitzgerald (G. F.). On the Electromagnetic Theory of Light, 691. 
G. 
Glazebrook (R. T.). Double Refraction and Dispersion in Iceland Spar, 421. 
Greenwich magnetic observations, conclusions from (see Ellis). 
H. 
Hicks (W. M.). On the Motion of Two Spheres in a Fluid, 455. 
Huggins (W.). On the Photographic Spectra of Stars, 669; addendum, 688. 
Hydrogen, lines presumably of, in stars, 678. 
I. 
Images, application of method of, to motion of two spheres in a fluid. 455. 
L. 
Light, electromagnetic theory of, 691 (see Fitzgerald). 
M. 
Magnetic elements, relation between diurnal range of, and sun spots, 541 (see Ellis). 
Moulton (J. F.) and Spottiswoode (W.) (see Spottiswoode). 
P. 
Paraffins, substances produced from, 451. 
Phosphorescence in vacuum tubes, 580 (see Spottiswoode). 
Photographic preparation suitable to receiving impressions from the infra-red, 655. 
R. 
Eadiolarians, supposed, (see Williamson). 
S. 
Satellite, secular changes in the elements of the orbit of a, revolving abotit a tiddly distorted planet (see 
Darwin) . 
Schorlemmer (C.). On the Normal Paraffins.—Part III., 451. 
Spectra of stars, 669 (see Huggins). 
Spectrum, photographic method of mapping the least refrangible end of the solar, 653. 
Spheres, motion of two, in a fluid, 455 (see Hicks). 
Spottiswoode (W.) and Moulton (J. F.). On the Sensitive State of Vacuum Discharges.—Part II., 561 
(for contents see p. 561). 
Stars, description of the photographic spectra of, 677. 
Sun spots, relation of, to magnetic disturbances (see Ellis). 
