548 



INDEX. 



Drach (Mr. S. M.) on Epicyclical 

 curves, 487. 



Dyeing, observations on the process 

 of, 221. 



Earnshaw (Rev. S.) on the transfor- 

 mation of linear partial differential 

 equations, 24. 



Earth, on an experiment to determine 

 the density of the, 95 ; on the va- 

 riation of gravity at the surface of 

 the, 228. 



Egg, on the chemical nature of the, 

 158 ; on the inorganic constitu- 

 ents of the white and yolk of the, 

 286. 



Elastic solids, on an instrument for 

 measuring the extensibility of, 92. 



Electric current, on the sounds pro- 

 duced by the, 422. 



Electricity, development of, in the act 

 of muscular contraction, 53, 55 ; 

 of steam, observations on, 490. 



Emerylite, analysis of, 451. 



Enamel, on the structure of the, 

 540. 



Epicyclical curves, on an easy rule 

 for formularizing, 487. 



Equations, on the transformation of 

 linear partial differential, 24 ; gene- 

 ral methods in analysis for the re- 

 solution of linear, 147. 



Ethylamine, on the properties and 

 composition of, 312. 



Euphyllite, analysis of, 454. 



Falling stars, remarks on, 524. 



Fehling (M.) on the methods of as- 

 certaining the quantity of bromine 

 in solution in mother-v^^aters, 394. 



Fibrolite, on the identity of, with ky- 

 anite, 459. 



Fish, on the microscopic structure of 

 the scales and dermal teeth of some, 

 531. 



Fleitmann (M.) on the ashes of hu- 

 man fsBces and urine, 273. 



Forbes (Prof J. D.) on an instrument 

 for measuring the extensibility of 

 elastic solids, 92 ; on the refractive 

 and dispersive power of chloroform, 

 94 ; on the determination of the 

 earth's density, 95 ; on the alleged 

 evidence for a physical connexion 

 between stars forming binary or 

 multiple groups, arising from their 

 proximity alone, 132. 



Fresenius (Dr. C. R.) on the proper 



balance of the food in nutrition, 

 127 ; on the quantity of ammonia 

 contained in atmospheric air, 318.^ 



Gases, on the motion of, 541 . 



Geology, researches in physical, 66. 



Geometry and geometers, 497. 



Gerhardt (M.) oti the composition of 

 stearic acid, 237. 



Gladstone (Dr. J. H.) on the com- 

 pounds of the. halogens with phos- 

 phorus, 345. 



Glairidine, observations on, 78. 



Glairine, observations on, 75. 



Glaisher (J.) on the weather during 

 the quarters ending June 30 and 

 September 30, 1849, 137, 356 ; on 

 the reduction of the therraometrical 

 observations made at the apart- 

 ments of the Royal Society from 

 the year 1744-1781, and 1787- 

 1843, 151. 



Glass, on some modifications in the 

 colouring of, by metallic oxides, 

 439. 



Gold in certain mines of the depart- 

 ment of the Rhone, occurrence of, 

 309. 



Gold region of California, notes on, 

 470. 



Graham (T.") on the motion of gases, 

 541. 



Gravity, on the variation of, at the 

 surface of the earth, 228. 



Grove (W. R.) on the effect of sur- 

 rounding media on voltaic ignition, 

 114; on the direct production of 

 heat by magnetism, 153. 



Hamilton (Sir W. R.) on quaternions, 

 or on a new system of imaginaries 

 in algebra, 133, 200. 



Hargreave (C.J. ), researches concern- 

 ing numbers, 36 ; on general me- 

 thods in analysis, for the resolution 

 of linear equations, infinite differ- 

 ences, and linear differential equa- 

 tions, 147. 



Heat generated in a platinum wire by 

 a voltaic current, observations on, 

 114 ; on the direct production of, 

 by magnetism, 153 ; on the rota- 

 tion of the plane of polarization of, 

 by magnetism, 481 ; on the mecha- 

 nical equivalent of, 533. 



Hennessy (H.) on physical geology, 

 66. 



Herschel (Sir J. F. W.) on the deter- 



