512 



INDEX. 



Darwin (G. H.), the determination of 

 the secular effects of tidal friction by 

 a graphical method, 168. 



De La Rue (W.) and H. W. Muller, 

 experimental researches on the electric 

 discharge with the chloride of silver 

 battery, 281. 



Definite integrals, certain, occurring in 

 spherical harmonic analysis (Niven), 2. 



Definite integrals involving elliptic func- 

 tions (Glaisher), 331. 



Definite integrals, on certain : No. 5 

 (EusseU), 361. 



Dewar (J.) and Gr. D. Liveing, note on 

 spectroscopic papers, 166. 



on the formation of hydro- 

 cyanic acid in the electric arc, 188. 



and A. Scott on the vapour densi- 

 ties of potassium and sodium, 206. 



further experiments, 490. 



and G-. D. Liveing, on the spectra 



of sodium and potassium, 398. 



on the reversal of the lines of 



metallic vapours : No. YII, 402. 



Diurnal range of magnetic declination 

 and horizontal force, and the period of 

 solar spot frequency, relation between 

 (Ellis), 43. 



Dodgson (W.) and B. Stewart, prelimi- 

 nary report to the Committee on Solar 

 Physics on a method of detecting the 

 unknown inequalities of a series of 

 observations, 106. 



preliminary report to the 



Committee on Solar Physics on the 

 evidence in favour of the existence of 

 certain short periods common to solar 

 and terrestrial phenomena, 303. 



Donation Eund, account of grants from 

 the, in 1878-79, 440. 



Double refraction and dispersion in Ice- 

 land spar (Glazebrook) , 202. 



Downes (A.) and T. P. Blunt, note upon 

 the behaviour of oxalic acid and the 

 oxalates of the alkalies and of potas- 

 sium iodide in sunlight, 219. 



Elasticity of metals, preliminary experi- 

 ments on the effects of long- contin vied 

 stress on the (Bottomley), 221. 



Election of Council and Officers, 431. 



Election of Fellows, annual meeting for, 

 150. 



Electric arc, on the formation of hydro- 

 cyanic acid in the (Dewar), 188. 



Electric discharge with the chloride of 

 silver battery, experimental researches 

 on the (De La Rue and Muller), 281. 



Electrical discharges through rarefied 

 gases, sensitive state of (Spottiswoode 

 and Moulton), 21. 



Ellipsoid and ellipse, expansion in series 

 of the potentials of (Niven), 2. 



Ellis (W.), on the relation between the 

 diurnal range of magiietic declination 

 and horizontal force, as observed at the 

 Royal Observatory, Greenwich, during 

 the years 1841 to 1877, and the period 

 of solar spot frequency, 43. 



Elphinstone (Lord) and C. W. Vincent r 

 preliminary note on magnetic circuits 

 in dynamo- and magneto-electric 

 machines, 292. 



Essential oils, action of, on the ultra- 

 violet rays of the spectrum (Hartley 

 and Huntington), 290. 



Ettingshausen (Baron), report on 

 phyto-palaeontological investigations 

 on the fossil flora of Sheppev, 388. 



Everett (J. D.), elected, 150. 



Expansion in series of the potentials of 

 the ellipsoid, and of the ellipse 

 (Niven), 2. 



Explosives, researches on : No. II . 

 Fired gunpowder (Noble and Abel), 

 123. 



Fellows deceased, 406. 



Fellows elected, 407. 



Financial statement, 433. 



Fired gunpowder, reseaches on explo- 

 sives : No. II (Noble and Abel), 123. 



Fortieth parallel in North America, 

 magnetic survey of (Thorpe), 1. 



Fossil flora of Sheppey, report on phyto- 

 palseontological investigations on the, 

 (Ettingshausen), 388. 



Francois de Chaumont (F. S. B.), 

 elected, 150 ; admitted, 150. 



Froude, William, obituary notice of, ii. 



Fund, Donation, account of grants 

 from the, in 1878-79, 440. 



Fund, Government, account of appro- 

 priations from the, 442. 



GJralton (F.), the geometric mean in 



vital and social statistics, 365. 

 Gamgee (A.), and E. Blankenliorn on 



the existence of Liebreich's protagon 



in the brain, 151. 

 Geometric mean, the, in vital and social 



statistics (Galton), 365. 

 the law of the (McAlister) . 



367. 



Gilbert (J. H.) and J. B. Lawes, agri- 

 cultural, botanical, and chemical 

 results of experiments on the mixed 

 herbage of permanent meadow, con- 

 ducted for more than twenty years in 

 succession on the same land, 230. 



Glacial period, bearing of the parallel 

 roads of Lochabar on other pheno- 

 mena of (Prestwich), 6. 



Glaisher (J. W. L.), separate enumera- 

 tions of primes of the form 4» + 1 and 

 of the form 4n + 3, 192. 



