441 



INDEX to VOL. XV. 



AlR, on the electrification of the, 70. 



Atmosphere, on the amount of car- 

 bon dioxide in the, 46, 151. 



Atomic weights, on the relation be- 

 tween the heats of combination of 

 the elements and their, 42. 



Auroral beam of November 17, 1882, 

 on the, 318. 



Ayrton (Prof. W. E.) on the resist- 

 ance of the electric arc, 346 ; on 

 winding electromagnets, 397. 



Baily (H.) on the spectra formed by 

 curved diffraction-gratings, 183. 



Barrett (Prof. W. F.) on the alleged 

 luminosity of the magnetic field, 

 270. 



Bath, on a new form of constant- 

 temperature, 339. 



Becquerel (H.) on the phosphoro- 

 graphy of the infra-red region of 

 the solar spectrum, 223. 



Bidwell (S.) on the electrical resist- 

 ance of selenium cells, 31 ; on a 

 method of measuring electrical 

 resistances, 316. 



Bolometer, description of the, 174. 



Boltzmann (Prof.) on the direct pho- 

 tography of sound-vibrations, 1-51. 



Books, new : — Fisher's Physics of the 

 Earth's Crust, 56 ; Ballard's Solu- 

 tion of the Pyramid Problem, 59 ; 

 Peacock's Saturated Steam the 

 Motive Power in Volcanoes and 

 Earthquakes, 60; Piazzi Smyth's 

 Madeira Spectroscopic, 144 ; 

 Routh's Dynamics of a System of 

 Rigid Bodies, 218. 



Bosanquet (R. H. M.) on magneto- 

 motive force, 205 ; on an arrange- 

 ment for dividing inch- and metre- 



scales, 217 ; on permanent magne- 

 tism, 257, 309 ; on self-regulating 

 dynamo-electric machines, 275. 



Browne (W. R.) on central forces 

 and the conservation of energy, 

 35, 228 ; on the use of the term 

 " force," 368. 



Capillarity, on the theories of, 47, 

 191, 198. 



Capron (J. R.) on the auroral beam 

 of November 17, 1882, 318. 



Central forces and the conservation 

 of energy, on, 35, 152, 228, 299. 



Chappuis (J.) on the refraction- 

 indices of gases at high pressures, 

 299. 



Clausius (Prof. R.) on the connexion 

 between the units of magnetism 

 and electricity, 79. 



Close (Rev. M. H.) on the meaning 

 of " force," 248. 



Colour-sensation, on, 373. 



Conroy (Sir J.) on a new photo- 

 meter, 423. 



Cook (E. H.) on the amount of car- 

 bon dioxide in the atmosphere, 

 151 ; on the regenerative theory of 

 solar action, 400. 



Crafts (J. M.) on the exactness of 

 the measurements made with mer- 

 curial thermometers, Q6. 



Crystalline films, on optical combi- 

 nations of, 301. 



David (T. W. E.) on glacial action 

 in South Brecknockshire, 62. 



Difrr action-gratings, on the spectra 

 formed by curved, 183 ; on curved, 

 414. 



Dissociation, on Lockyer's theory of, 

 28. 



