IMUEX. 



531 



vera causa of natural philosophy, 248 ; 

 *on a theorem relating to the trans- 

 formation of series, 291. 



Economic Science and Statistics, Ad- 

 dress by G. Shaw Lefevre to the Sec- 

 tion of, 479. 



Elasticity of wires, secular experiments 

 upon the, report of the Committee for 

 commencing, 33. 



Electric illumination, the amount of ni- 

 trous acid produced in, Prof. Dewar 

 on, 317. 



Electric lighting, recent advances in, J. 

 N. Shoolbred on, 503. 



♦Electrical gyrostat, Prof. G. Forbes on 

 an, 290. 



Electricity, some problems in the con- 

 duction of, A. J. C. Allen on, 261. 



♦Electrometer key, a new, Dr. O. J. 

 Lodge on, 258. 



Elementary natural science in the board 

 schools of London, Dr. J. H. Gladstone 

 on, 475. 



Elementary science, the system of in- 

 struction in, introduced by the Liver- 

 pool School Board into their schools, 

 some account of, by E. M. Hance, 

 477. 



Elliptic functions, formulae in, J. W. L. 

 Glaisher on, 269. 



*Erman (Prof.) on German explorations 

 in Africa, 440. 



Erratic blocks of England, Wales, and 

 Ireland, seventh report on the, 135. 



*Ether, the, in connection with Maxwell's 

 theory of electricity, a hypothesis con- 

 cerning, Dr. O. J. Lodge on, 258. 



Etherspheres as a vera cattsa of natural 

 philosophy, Rev. S. Earnshaw on, 248. 



♦Euphrates Valley railway, Commander 

 V. L. Cameron on the, 440. 



Evans (J.) on the exploration of Kent's 

 Cavern, 140; on the exploration of 

 certain caves in Borneo, 149. 



Everett (A. H.) on the exploration of 

 certain caves in Borneo, 149. 



Everett (Prof. J. D.) on the progress of 

 the chief branches of mathematics and 

 physics, 37 ; on underground tempera- 

 ture, 40 ; on atmospheric electricity at 

 Madeira, 63 ; on some broad features 

 of underground temperature, 345. 



Evidence of early historic events and 

 pre-historic customs by perpetuation 

 of design in art and manufactures in 

 later, and even in present, times, Dr. 

 Phene on, 397. 



♦Explosive agents recent researches in, 

 F. A. Abel on, 293. 



Export trade of the United Kingdom, 

 the decay in the, S. Bourne on, 470. 



Farr (Dr.) on the work of the Anthropo- 

 metric Committee, 175. 



Farrer (J. A.) on savage and civilised 

 warfare, 396. 



Fellows (F. P.) on the work of the Anthro- 

 pometric Committee, 175. 



Fetishism, the origin of, A. Lang on, 

 396. 



Field (R.) on the datum-level of the 

 Ordnance Survey of Great Britain, and 

 the tabulation and comparison of other 

 datum-marks, 219; on self-acting in- 

 termittent siphons, and the conditions 

 which determine the commencement 

 of their action, 223. 



Firearms, the bursting of, when the 

 muzzle is closed with snow, earth, &c, 

 Prof. G. Forbes on, 283. 



Fire-damp in mines, an instrument for 

 detecting, report of the Committee ap- 

 pointed to improve, 131. 



Fireless locomotive, Leon Francq's, C. 

 Bergeron on, 501. 



Fitzgerald (G. F.) on the tension of va- 

 pours near curved surfaces of their 

 liquids, 255. 



Fletcher (A. E.) on instruments for mea- 

 suring the speed of ships, 210; on an 

 anemometer for measuring the speed 

 of smoke or corrosive vapour, 279. 



♦Flight and its imitations," F. W. Breary 

 on, 292. 



Flight (W.) on observations of luminous 

 meteors during the year 1878-79, 

 76. 



Flint implements from the valley of the 

 Bann, W. J. Knowles on, 389. 



Flower (Prof.) on the steps taken for 

 investigating the natural history of 

 Socotra, 210. 



Forbes (Prof. G.) on atmospheric electri- 

 city at Madeira, 63; on observations 

 of luminous meteors during the year 

 1878-79, 76 ; *on the question of im- 

 provements in astronomical clocks, 131 ; 

 on an instrument for detecting tire- 

 damp in mines, 131 ; *on an instru- 

 ment for determining the sensible 

 warmth of air, 277; on the bursting 

 of firearms when the muzzle is closed 

 with snow, earth, &c, 283 ; *on an 

 electrical gyrostat, 290. 



Forces directed towards fixed, or mov- 

 able, centres, the condition which must 

 be fulfilled by any number of, in order 

 that any given curve should be described 

 freely by a particle acted on by these 

 forces simultaneously, A. H. Curtis on, 

 and an analogous problem, 290. 



♦Fossil tree from the Upper Silurian of 

 Ohio, E. W. Claypole on a, 343. 



Fossils found in a bed of Devonian rocks 

 at Saltern Cove, in Torbay, and in a 

 quarry of the Old Red Sandstone, near 

 Caerleon, in Monmouthshire, J. E. Lee 

 on, 332. 

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