568 



INDEX. 



Smoke-jets by intermittent vision, on, 

 188. 



Specific gravity, on an easy method 

 of determining the, of solids, 459. 



Spectrum, on the experimental deter- 

 mination of wave-lengths in the 

 invisible prismatic, 194 ; of hydro- 

 gen, on the second, 329. 



Spheres, on electro-magnetic induc- 

 tion in, 326. 



Storms, on the electricity of, 492. 



Sun, electrical action of the, 492. 



Sun-spots, on the temperature of, 

 247, 302. 



Sylvester (Prof. J. J.) on the solution 

 of a class of equations in quater- 

 nions, 392. 



Tait (Prof.) on Listing's Topologie, 

 30. 



Teall (J. J. H.) on the petrology of 

 some North - of- England dykes, 

 321. 



Tension-galvanometer, on a standard, 

 27. 



Thermoelectricity of crystals, on a 

 method of investigating the, 328. 



Thompson (C.) on the determination 

 of chemical affinity in terms of 

 electromotive force/ 282, 377. 



Thompson (Prof. S. P.) on a new- 

 insulating support, 134 ; on the 

 adjustment of resistance cells, 

 265; on a modified resistance- 

 balance, 507. 



Tomlinson (H.) on Hall's phenome- 

 non, 400. 



Topologie, on Listing's, 30. 



Tromelin (M. de) on the causes of 

 the production of atmospheric elec- 

 tricity, 245. 



Tyndall (Prof. J.) on rainbows, 61 ; 

 on the white rainbow, 148 ; on rain- 

 bows and glories, 244. 



Violle (Prof. J.) on the absolute 

 standard of light, 563. 



Volcanic group of St. Davids, on the, 

 322. 



Wallace (A. R.) on geological cli- 

 mate, 81, 367. 



Water and ice, on the properties of, 

 156. 



Wave-lengths, on the determination 

 of, in the invisible prismatic spec- 

 trum, 194. 



Wiedemann (Prof. E.) on the tempe- 

 rature of sun-spots, 247. 



Wild (H.) on a method of determin- 

 ing the magnetic inclination with 

 the induction-compass, 407 ; on 

 earth currents, 559. 



Wright (Dr. C. R. A.) on the deter- 

 mination of chemical affinity in 

 terms of electromotive force, 282, 

 377. 



Wroblewski (S.) on the temperature 

 obtained by oxygen in a state of 

 ebullition, and on the solidification 

 of nitrogen, 158 ; on the boiling- 

 point of oxygen, of air, and of 

 carbonic oxide under ordinary 

 atmospheric pressure, 490. 



END OF THE SEVENTEENTH VOLUME. 



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