54$ 



INDEX to VOL. XLVIII. 



ABNEY (Capt,) on the opacity of 

 the developed photographic image, 

 161. 



Acoustics, researches in, 266, 371, 

 445, 513. 



Affinity, on the relations between, 

 and dissected formulae, 401. 



Amsler's planimeter, on, 11. 



Atmosphere, on the constant currents 

 of the, 21, 97, 166; on the refrac- 

 tion of sound by the, 530. 



Atmospheric precipitation, on the 

 cosmic dust which falls with, 546. 



Audition, experimental illustration of 

 Helmholtz's hypothesis of, 273 ; 

 on the mechanism of, 445. 



Barrett (Prof. W. F.) on a modifica- 

 tion of the usual trombone appa- 

 ratus for showing the interference 

 of sound-bearing waves, 139. 



Bertrand (J.) on the action of two 

 elements of a current, 314. 



Books, new : — Goodeve's Principles 

 of Mechanics, 62; Johnson's 

 Eclipses, Past and Future, 64; 

 Plateau's , Statique Experimental 

 et Theorique des [Liquides, 140 ; 

 Birt's Contributions to Selenogra- 

 phy, 141 ; Twisden's First Lessons 

 in Theoretical Mechanics, 298; 

 Butler's First Book of Euclid's 

 Elements, 300 ; Cuthbertson's Eu- 

 clidian Geometry, ib.-, Grove's 

 Correlation of Physical Forces, 

 467 ; Willson's Elementary Dyna- 

 mics, 471 ; Heath's Exposition of 

 the Doctrine of Energy, 527; 

 Proctor's Transits of Venus, 529 ; 

 Huggins's Approaching Transit of 

 Venus, ib. 



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

 ment, or the di\ ision ( f the octave, 

 ,507. 



Capillary tubes, on the flow of saline 

 solutions through, 77 ■ 



Carbon, on the spectrum of, 369, 

 456. 



Castor- oil, on the behaviour of cer- 

 tain fluorescent bodies in, 165. 



Challis (Prof.) on the hydrodynami- 

 cal theory of the action of a galva- 

 nic coil on an external small mag- 

 net, 180, 350, 430. 



Chapman (Prof. E. J.) on the cause 

 of tides, 157- 



Chemical mass, on Gladstone's ex- 

 periments relating to, 241. 



Chloral hydrate, on the action of sul- 

 phide of ammonium upon, 247- 



Clausius (Prof. R.) on different forms 

 of the virial, 1 . 



Clowes (F.) on a glass cell with par- 

 allel sides, 61. 



Cobalt, on the maximum of magnetism 

 of, 321. 



Comets and their tails, on, 512. 



Compass, on the perturbations of the, 

 produced by the rolling of the ship, 

 363. 



Condensers, on the polarization of 

 the plates of, 478. 



Conductivity, on unilateral, 251. 



Cottrell (J.) on the division of a 

 sound-wave by a layer of flame or 

 heated gas into a reflected and a 

 transmitted wave, 222. 



Crookes (W.) on the action of heat 

 on gravitating masses, 65 ; on at- 

 traction and repulsion accompany- 

 ing radiation, 81. 



Crystals, on a simple arrangement by 

 which the coloured rings of uni- 

 axial and biaxial, may be shown in 

 a microscope, 138. 



Culex mosquito, on the supposed 

 auditory apparatus of the, 3/1. 



