565 



INDEX to VOL. L. 



ABNEY (Capt.) on photographic ir- 

 radiation, 46. 



Acoustic reversibility, on, 146. 



Adams (Prof. W. G.) on a new pola- 

 riscope, 13; on the forms of equi- 

 potential curves and surfaces and 

 lines of electric force, 548. 



Airy (Sir G. B.) on a controverted 

 point in Laplace's theory of the 

 tides, 277- 



Alloys of platinum and iridium, on 

 the density of, 558. 



of silver and copper, on the 



liquation, fusibility, and density of 

 certain, 553. 



Aluminium, on the augmentation of 

 the chemical activity of, 2S4. 



Atmosphere, on the refraction of 

 sound by the, 62, 146. 



Aymonet (M.) on the cold bands of 

 dark spectra, 33 1 . 



Barker (Prof. G. F.) on a new vertical- 

 lantern galvanometer, 434. 



Basalt, on the origin and mechanism 

 of production of the prismatic 

 structure of, 122, 201. 



Bauerman (H.) on an experiment 

 for showing the electric conduc- 

 tivity of various forms of carbon, 

 24. 



Boisbaudran (Lecoq de) on the che- 

 mical and spectroscopic characters 

 of gallium, 414. 



Boltzmann (Prof. L.) on thermic 

 equilibrium and heat-conduction in 

 gases, 4 { J5. 



Books, new : — Helmholtz's Sensa- 

 tions of Tones, 319 ; Croll's Cli- 

 mate and Time, 322 ; Whitaker's 

 Guide to the Geology of London 

 and the neighbourhood, 406. 



Boracic acid, on fused, and its tem- 

 pering, 158. 



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

 ment, or the division of the octave, 

 164 ; on the polarization of the 

 light of the sky, 497. 



Bunsen (Prof. R.), spectral-analytical 

 researches by, 417, 527. 



Carbon, on the electric conductivity 



t of various forms of, 24. 



Carpenter (Dr. W. B.) on oceanic cir- 

 culation, 402. 



Challis (Prof.) on the mathematical 

 principles of Laplace's theory of 

 tides, 544. 



Chase (Prof. P. E.) on the cosmical 

 activity of light, 250. 



Chautard (J.) on the action of mag- 

 nets on rarefied gases, 77 > 



Chemical formulae, on nodes and 

 loops in connexion with, 367. 



Clausius (Prof. R.) on the theorem of 

 the mean ergal, and its application 

 to the molecular motions of gases, 

 26, 101, 191. 



Cockle (Sir J.) on a differential criti- 

 coid, 440. 



Cooke (Prof. J. P.) on two new va- 

 rieties of vermiculites, 135. 



Copper, on the application of phos- 

 phorus to the " poling " of, 542. 



Copper and silver, on the liquation, 

 fusibility, and density of certain 

 alloys of, 553. 



Copper-zinc couple, on the action of 

 the, 285. 



Cowper (R.) on artificially crystallized 

 oxide of zinc from a blast-furnace, 

 414. 



Criticoid, on a differential, 440. 



Croll (J.) on the wind and gravitation 



