464 



INDEX. 



imaginary roots in an equation, 



232, 363. 

 Tait (P. G.) on the heating of a disk 



by rapid rotation in vacuo, 314. 

 Telegraph lines, on the possibility of 



curing the retardation of electric 



waves in submarine, 440. 

 Templeton(R.)onamethod of utilizing 



compact logarithmic tables, 221 ; 



on fractions for the value of M, 434. 

 Thalen (R.) on the determination of 



the limit of elasticity in metals, J 94. 

 Thallium, on some new salts of, 256. 

 Thermodynamics, on the second law 



of, 241 ; researches on, 407. 

 Thermo-elements of great electromo- 

 tive force, on some, 77 - 

 Thomsen (Prof. J.) on the mechanical 



equivalent of light, 246. 

 Thomson (Prof. W.) on the elasticity 



and viscosity of metals, 63. 

 Tin, on native, 142. 

 Torpedo, on the electricity of the, 4 53. 

 Tresca (M.) on the production of cy- 

 linders of ice by pressure through 



orifices, 239. 

 Troost (M.) on zirconium, 257 ; on 



the intensity of the light produced 



by the combustion of magnesium, 



448. 

 Tropine, preparation and properties 



of, 362. 

 Tungsten, on the chlorides of, 255. 

 Twilight, observations on, 419. 



Tyndall (Prof.) on ice and glaciers, 

 393. 



Ulex (G. L.) on the general existence 

 of copper in the animal kingdom, 

 384. 



Van der Kolk (Dr. H. W. S.) on the 

 velocity of sound, 34, 391. 



Vionnois (M.) on the reflexion of 

 sound, 240. 



Vision, on some phenomena of, 271. 



Voltaic circuit, on the thermal action 

 in the wire of a, 191. 



Water-barometer, on the construction 

 of a new, 349. 



Waterston (J. J.) on the thermal ac- 

 tion in the wire of a voltaic circuit, 

 191 3 on electric conduction, and 

 the possibility of curing the retar- 

 dation of electric waves in subma- 

 rine telegraph lines, 440. 



Wharton (J.) on a possible method of 

 determining the distance of certain 

 variably coloured stars, 386. 



Wiedemann (Prof.) on the magnetism 

 of salts of the magnetic metals, 366. 



Winkler (M.) on indium, 443. 



Woods (Dr. T.) on the thermic equi- 

 valent of magnesium, 49. 



Xylole, researches on, 356. 



Young (Prof. J. R.) on Newton's rule 

 for determining the number of 

 imaginary roots in an equation, 

 113,232,289,363. 



Zirconium, researches on, 257. 



END OF THE THIRTIETH VOLIME. 



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