548 



INDEX. 



Planets, on the ellipticity of, 229. 



Probabilities, on a priori, 204. 



Reade (T. M.) on rock-fragments 

 from tlie South of Scotland im- 

 bedded in the Boulder-clay of Lan- 

 cashire, 155 ; on ripple-marks in 

 drift, 156. 



Refraction, on geometrical methods 

 in the theory of, 485. 



Rocks, on the function of water in 

 affecting, 117. 



Rutley (F.) on strain in connexion 

 with crystallization, 157. 



Salts, on the thermal relationship 

 between water and certain, 123. 



Salt-solutions and attached water, 

 on, 22, 105 ; on the molecular vo- 

 lumes of, 179 ; on the boiling-points 

 of, 364. 



Schneebeli (H.) on radiant heat, 

 468. 



Schumann (0.) on the coefficient of 

 friction of gases and vapours, 544. 



Schweins' (F.) discoveries in the 

 theory of determinants, on, 416. 



Solar spectrum, on the wave-lengths 

 of the principal lines and bands in 

 the infra-red portion of the, 465. 



Solution, on the nature of, 364. 



Sound, on the velocity of, in air, 328. 



Specific gravity of certain substances 

 in the solid state and in aqueous 

 solution, on the, 405. 



Spectral lines of the metals developed 

 by exploding gases, on the, 161. 



Speed-indicator, on a, for ships' pro- 

 pellors, 57. 



Steel, on the distribution of density 

 and hardness in tempered, 478. 



Stellar systems, on harmonic motion 

 in, 200. 



Strenger (F.) on the conductivity of 

 tourmaline for heat, 427. 



Sunshine -recorder, on a new, 141. 



Sylvester's (Prof. J. J.) on contra- 

 riants, 374 ; on Hamilton's quad- 

 ratic equation, 454. 



Teall (J. J. H.) on the chemical and 

 microscopical characters of the 

 Whin Sill, 384. 



Thermal and volume changes attend- 

 ing mixture, on some, 495. 



Thomson (J. J.) on the chemical 

 combination of gases, 233. 



Tourmaline, on the conductivity of, 

 for heat, 427. 



Triethylamine, on the refractive 

 index of, 499. 



Trouton (F.) on molecular latent 

 heat, 54. 



Tuning-fork, on the determination by 

 electrical observations of the period 

 of a, 98. 



Turpin (G„ S.) on the apparent vis- 

 cosity of ice, 120. 



Vapours and gases, on the coefficient 

 of friction of, 544. 



Vapour-tension of some mixed 

 liquids, on the, 510. 



Warburg (E.) on the electrolysis of 

 solid glass, 159. 



Warrington (A. W.) on the apparent 

 viscosity of ice, 120. 



Water, on salt- solutions and attached, 

 22, 105 ; on the thermal relation- 

 ship between certain salts and, 123 ; 

 on the electrical conductivity of, 

 distilled in vacuo, 542. 



of crystallization, on, 379. 



Websky (M.) on idunium, 232. 



Wethered (E.) on the structure and 

 formation of coal, 156. 



Wiedemann (Prof. E.) on the elec- 

 tric discharge in gases, 35, 85. 



Wleiigel (S.) on the magnetism of 

 organic bodies, 78. 



Worthington (A. M.) on the surface- 

 forces in fluids, 334. 



END OF THE EIGHTEENTH VOLUME. 



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