469 



INDEX to VOL. XLII. 



AlR, on the resistance of, to the 

 motion of vortex-rings, 203. 



Airy (G. B.) on the law of the pro- 

 gress of accuracy in the process 

 for forming a plane surface, 10/. 



Allophane, note on, 155. 



Alvergniat (M.) on some luminous 



tubes with exterior electrodes, 319. 



Angstrom (A.) on the spectra of the 

 simple gases, 395. 



Antimony, on a native sulphide of, 

 from New Zealand, 236. 



Atmosphere, on the general circula- 

 tion and distribution of the, 199. 



Atomic theory, on the, 112. . 



Ball (Prof. R. S.) on the cylindroid, 

 181 ; on the resistance of air to the 

 motion of vortex-rings, 208. 



Beltzmann (L.) on the boiling-points 

 of organic bodies, 393. 



Berthelot (M.) on the change of pres- 

 sure and volume produced by che- 

 mical combination, 152. 



Blood, on the constitution of, 129. 



Boiling-points of organic bodies, on 

 the, 393. 



Books, new : — Rollwyn's Astronomy 

 simplified, 69 ; Watson's Elements 

 of Plane and Solid Geometry, 

 312; Crookes's Select Methods in 

 Chemical Analysis, 314 ; Hiley's 

 Explanatory Mensuration, 381. 



Bromine, on the action of light on, 

 290. 



Budde (Dr. E.) on the action of 

 light on chlorine and bromine, 290. 



Calculus of variations, on the appli- 

 cation of a new integration of dif- 

 ferential equations to some un- 

 solved problems of, 28, 302, 440. 



Cayley (Prof.) on a supposed new in- 

 tegration of differential equations 

 of the second order, 197; on Gauss's 

 Pentagramma mirificum, 311. 



Challis (Rev. Prof.) on the application 



of a new integration of differential 

 equations of the second order to 

 some unsolved problems in the cal- 

 culus of variations, 28, 302. 



Chemical combination, on the change 

 of pressure and volume produced 

 by, 152. 



dynamics, on a law in, 226. 



Chemistry, on statical and dynamical 

 ideas in, 112. 



Chlorine, on the action of ligh t on, 290 . 



Chlorochroraic anhydride, on the ab- 

 sorption-spectrum of, 41. 



Chromosphere, on the bright lines in 

 the spectrum of the, 377. 



Clausius (Prof. R.) on the mechanical 

 theory of heat, 161 ; on the appli- 

 cation of a mechanical equation to 

 the motion of a material point 

 round a fixed centre, and of two 

 material points about each other, 

 321. 



Climate, on the influence of a cover- 

 ing of snow on, 156. 



Colding (L. A.) on the universal 

 powers of nature and their mutual 

 dependence, 1. 



Comet I., 1871, on the spectrum of, 

 223. 



Cornu (A.) on the reversal of the lines 

 of the spectra of metallic vapours, 

 237. 



Corona, on the eruption theory of 

 the, 160. 



Croll (J.) on the physical cause of 

 ocean -currents, 241. 



Culley (R. S.) on electro- telegraphy, 

 159. 



Current, on a method of measuring 

 the lateral diffusion of a, 444. 



Curves, on a correction sometimes 

 required in, professing to represent 

 the connexion between two physical 

 magnitudes, 441. 



Cylindroid, on the, 181. 



