556 



INDEX. 



of a tessarine ; on the derivation of 

 the word theodolite ; and on light 

 under the action of magnetism, 

 290. 



Colours, complementary, on the 

 theory of, 403. 



Colson's method of developing an in- 

 commensurable fraction, observa- 

 tions on, 128. 



Comet of Halley, on the past history 

 of the, 470. 



Coplanarity and homoconicism, on 

 the quaternion expressions of, 379- 



Cox (H.) on impact on elastic beams, 

 239. 



Cranmore (R. T.) on some phseno- 

 mena of defective vision, 485. 



Crystals, on the deportment of, be- 

 tween the poles of a magnet, 178. 



Daraour (M. A.) on brongniardite, a 

 new mineral, 477, 



Davies (T. S.) on geometry and geo- 

 meters, 382. 



Dawes (Rev. W. R.) on the phseno- 

 mena attending the disappearance 

 of Saturn's ring, 307- 



Decimals, interminable, on a property 

 of the, 15. 



Dessaignes (M.) on the formation of 

 aspartic acid from bimalate of am- 

 monia, 482. 



Deville (M. H.) on the action of hy- 

 drochloric acid on the hydrates of 

 oil of turpentine, 66 ; on the oil of 

 elemi, 243. 



Diffraction, on the dynamical theory 

 of, 235. 



Dolfuss (Ch.) on the presence of hip- 

 puric acid in the blood, 158. 



Donkin (W. F.) on the geometrical 

 laws of the motion of a rigid sj'stem 

 about a fixed point, 427 ; on the 

 geometrical interpretation of qua- 

 ternions, 489. 



Drach's (Mr. S. M.) thermometric 

 scale, 65. 



Duncan (A.) on two new salts of 

 chromic acid, 109. 



Durocher (M.) on the association of 

 silver with metallic minerals, and 

 methods of extracting it, 153 ; on 

 the presence of lead, copper, and 

 silver in sea- water, and of the last 

 metal in organized beings, 156. 



Elastic beams, experiments on impact 

 on, 239. 



Electrical wave, on the velocity of 



the, through a metallic circuit, 284. 

 Electricity, atmospheric, connexion 



of, with the condensation of vapour, 



161. 

 of condensation, connexion of, 



with lightning and the aurora, 103 ; 



observations on the, 303, 

 Electric telegraph, on the first idea of 



the, 401. 

 Electro-magnetic induction, effects of, 



on the conductibility of bodies, 424. 

 Electro-magnetism as a motive power, 



on the application of, 550. 

 Electro-physiological researches, 468. 

 Elemi, experiments on the oil of, 243. 

 Elliot (Capt. C. M.) on the magnetic 



survey of the Indian Archipelago, 



542. 

 Embolite, analysis of, 23. 

 Erlenmeyer (M. E.) on the compo- 

 sition of the precipitate formed in 



soluble cyanides by subacetate of 



lead, 403. 

 Erythrosine, on the preparation and 



properties of, 244. 

 Fluids, elastic, researches relative to 



the laws of dilatation and com- 



pressibihty of, 43. 

 Fractions, incommensurable, on the 



method of developing, 128. 

 Francolite, chemical examination of, 



134, 

 Fritzsche (M.) on konichalcite, 24, 

 Garot (M.) on the action of nitric 



acid on rhubarb, 244, 

 Gas-burner, on an apparatus for re- 

 gulating the heat produced by a, 



483, 

 Gases, on the electromotive force of, 



81. 

 Geodesy, on a problem of, 96. 

 Geological prizes, 158. 

 Geometrical laws of the motion of a 



rigid system about a fixed point, on 



the, 427. 

 Geometry and geometers, 382, 

 Geometry of Boethius, on the con- 

 nexion of Pope Gerbert with the, 



529. 

 Gerhardt (M.) on the dry distillation 



of camphorate of lime, 67- 

 Gibbon (J. H.) on a meteorite in 



North Carolina, 240. 

 Giwartowski (M.) on glaucolite, 25. 

 Glaisher (J.) on the weather during 



