1092 
INDEX. 
S. 
Satellite, secular changes in the elements of the orbit of a, revolving about a tidally distorted, planet (see 
Darwin) . 
Schorlemmeb (C.). On the Normal Paraffins.—Part HI., 451. 
Siemens (C. W.). On the Dynamo-electric Current, and on Certain Means to Improve its Steadiness, 
1071. 
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). 
T. 
Telescopes, mountings of large, 153. 
Thermographs, discussed, of Lamansky, 663; of Herschel, 664. 
Theta-functions, memoir on, 897 (see Cayley). 
Tuning-forlcs, determination of the rate of vibration of, 1. 
U. 
Ulodendron, 499. 
V. 
Vogel (H. C.). Examination of his Results as to the Action of Dyes on a Sensitive Collodion Film, 653. 
Voltaic action, contact theory of, 15. 
W. 
Williamson (W. C.). On the Organization of the Fossil Plants of the Coal-Measures.—Part X. 
Including an Examination of the Supposed Radiolarians of the Carboniferous Rocks, 493; supple¬ 
mentary observations, 532. 
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