INDEX. 
559 
S. 
Spectra of gases at high exhaustions, 414, 418, 420, 426. 
Solar system, evolution of, 512. 
Spherical shell, induction of electric current in, 345. 
Spottiswoode (W.). On the Forty-eight Coordinates of a Cubic Curve in Space, 375. 
Stokes (G. G.). Note on the Reduction of Mr. Crookes’s Experiments on the Decrement of the Arc of 
Vibration of a Mica Plate oscillating within a Bulb containing more or less Rarefied gas, 435. 
T. 
Tidal friction of a planet attended by several satellites, 491. 
V. 
Viscosity of gases, 387, 435. 
W. 
Water, thermal conductivity of, 537. 
Williamson (W. C.). On the Organization of the Fossil Plants of the Coal-Measures.—Part XI., 283.— 
General conclusions respecting the Carboniferous Lycopods, 295; Calamostachys Binneyana, 298; 
index to the plates, 302. 
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