[ 532 ] 



INDEX to VOL. XLL 



ABEGG (Prof. R.) on the freezing- 

 points of dilute solutions, 196. 



Acoustics, researches in, 168. 



Agassiz (A.) on underground tempe- 

 ratures at great depths, 78. 



Air, on the thermodynamic pro- 

 perties of, 288. 



Air-pump, on a duplex mercurial, 



878. ; 



Alternating-current arc, on the, 315, 

 507. 



Aluminium, on the acoustical pro- 

 perties of, 193. 



Anemometer, on the filar, 81. 



Appleyard (R.) on a direct-reading 

 platinum thermometer, 62 ; on an 

 adjustment of the Kelvin bridge, 

 50*6. 



Arc, on the alternating-current, 815, 

 507. 



Areometer, on a new, 530. 



Argon, on the spectra of, 149. 



Arrhenius (Prof. S.) on the influence 

 of carbonic acid in the air on the 

 temperature of the ground, 237. 



Atmosphere, on the influence of the 

 absorption of the, on the climate, 

 237. 



Atoms, on electrified, 151. 



Barometers, on a mechanical device 

 for performing the temperature 

 corrections of, 406. 



Barton (Dr. E. H.) on a graphical 

 method for finding the focal 

 lengths of mirrors and lenses, 59, 

 383. 



Barus (Prof. C.) on the filar anemo- 

 meter, 81. 



Basalt-plateaux of N.W. Europe, on 

 the Tertiary, 142, 



Benzene, on the latent heat of evapo- 

 ration of, 1. 



Bonney (Prof. T. G.) on erratic 

 boulders from the Kolguev beds, 

 77. 



Books, new: — Thomson's Elements 

 of the Mathematical Theory of 

 Electricity and Magnetism, 75 ; 

 Gregory's Exercise Book of Ele- 

 mentary Physics, 76 ; Vaschy's 

 Theorie de l'Electricite, 139 ; Ris- 

 teen's Molecules and the Molec- 

 cular Theory of Matter, 140; 

 Loudon and McLennan's Labora- 

 tory Course in Experimental 

 Physics, 141 ; Thompson's Dy- 

 namo-Electric Machinery, 234 ; 

 Poster and Atkinson's Joubert's 

 Elementary Treatise on Electri- 

 city and Magnetism, 234 ; Hol- 

 man's Computation Pules and 

 Logarithms, 235; Watts's Index 

 of Spectra, Appendix G, 462 ; 

 Atkinson's Du Bois's The 

 Magnetic Circuit, 517 ; Die Aus- 

 dehnungslehre, vollstandig und in 

 strenger Form bearbeitet von Her- 

 mann Grassmann, 518 ; Barker's 

 Graphical Calculus, 519. 



Briggs (L. J.) on the Rontgen rays, 

 381. 



Bromine, on the absorption spectrum 

 of solutions of, above the critical 

 temperature, 423. 



Burch (G. J.) on a method of draw- 

 ing hyperbolas, 72. 



Carbon in the sun, on, 450. 



Carbonic acid in the air, on the in- 

 fluence of, on the temperature of 

 the ground, 237. 



