INDEX. 



617 



Earth, mean specific gravity of the, 45 ; 

 secular changes of the magnetical sys- 

 tem of the, 49 ; figure, dimensions and 

 mean specific gravity of the, 111; sta- 

 bility of loose, 185. 



Earth's mean density, causes of the great 

 variation among the different measures 

 of the, 295. 



Earthwork, mathematical theory of the 

 stahility of, 60. 



Elasticity, elements of a mathematical 

 theory of, 85. 



Electric conductivity of nickel and iron, 

 546; copper, 550. 



Electric currents, peristaltic induction of, 

 121. 



Electric telegraph, on rapid signalling by 

 the, 299, 303. 



Electricity, statical, on quantitative mea- 

 surement in; 166. 



Electro-physiological researches, 209. 



Elephant, placenta of the, 471. 



Ellis (G. V.), researches into the nature 

 of the involuntary muscular fibre, 212. 



Equations, symmetric functions of the 

 roots of certain systems of two, 322, 

 323 ; resultant of a system of two, 322 ; 

 conditions for the existence of given 

 systems of equalities among the roots 

 of, 324. 



Ethylene, on some compounds of, 188. 



Excrements, human, immediate principles 

 of, 413. 



Fallopian tube conception, existence of 

 the decidua around the ovum within 

 the Fallopian tube, in four cases of, 

 534. 



Faraday (M.) on the relations of gold and 

 other metals to light, 356. 



Field (F.) on the existence of silver in 

 sea-water, 292. 



on the separation of iodine, &c., 



and the comparative affinity of these 

 elements for silver, &c., 496. 



Flexure, resistance of, 432. 



Fluids, alterations of temperature ac- 

 companying changes in pressure in, 564. 



Fluids in motion, thermal effects of, 41, 

 178,556. 



Foraminifera, researches on, 205. 



Frankland (E.), researches on organo- 

 metallic bodies : third memoir, 198. 



on a new series of compounds de- 

 rived from ammonia and its analogues, 

 502. 



Fungi, fructification of certain sphaeri- 

 aceous, 588. 



Gall-bladder, on the functions of the 

 mucous membrane of the, 133. 



Gasteropoda, natural affinities and classi- 

 fication of, 384. 



Glaciers, observations on, 331 ; plasticity 

 of ice, as manifested in, 455. 



Gold and other metals, relations of, to 

 light, 356. 



Gomes de Souza (J.) on the determination 

 of unknown functions which are in- 

 volved under definite integrals, 146; 

 addition to the memoir, 376. 



Gosse (P. H.) on the dioecious character 

 of the Rotifera, 66. 



Gravatt (W.), elementary considerations 

 on the subject of rotatory motion, 76. 



Guthrie (G. J.), obituary notice of, 272. 



Gyroscope, theory of the, 437. 



Haidinger (K.), elected foreign member, 

 229. 



Hancock (A.) on the organization of the 

 Brachiopoda, 463. 



Hansteen (C.) on the secular changes of the 

 magnetical system of the earth, &c., 49. 



Harley (Dr. G.) on the condition of the 

 oxygen absorbed into the blood during 

 respiration, 78. 



Harris (Sir W. S.) on quantitative mea- 

 surement in statical electricity, and on 

 some new phenomena of electrical 

 force, 166. 



Heart, cause of the rhythmic motion of 

 the, 473; experimental researches on 

 the influence of efforts of inspiration 

 on the movements of the, 596. 



Heat, on the existence of multiple pro- 

 portion in, 4, 211. 



Herapath (Dr. W. B.) on the detection 

 of strychnia by the formation of iodo- 

 strychnia, 149. 



on the optical characters of certain 



alkaloids associated with quinine, and 

 of the sulphates of their iodo-com- 

 pounds, 340. 



Hernia of the ovaries, history of two cases 

 of, 377. 



Hobarton, evidence of the existence of the 

 decennial inequality in the solar-diurnal 

 variations, &c. at, 314. 



Hodgkinson (Eaton), experimental re- 

 searches on the strength of pillars of 

 cast iron, 318. 



Hofmann (A. W.) on insolinic acid, 1. 



on some of the metamorphoses of 



naphthalamine, 10. 



on a new class of alcohols, 33, 511. 



on a new mode of forming triethyl- 



amine, 489. 



contribution towards the history of 



thialdine, 491. 



on the action of sulphuric acid upon 



anisic and salicylic acids, 494. 



