INDEX. 



543 



Nitric acid, new test for, 330 j known 

 to the ancient Egyptians, 339. 



Oils, volatile, on a method of distin- 



\; guishing certain, 636. 



Owen (Prof.) on some species of the 

 extinct genus Nesodon, 211. 



Percy (Dr. J.) on the distribution of 

 gold, 310. 



Phillips (K.) on the colours of a jet 

 of steam and of the atmosphere, 28. 



Hiotography, on the application of, 

 to the microscope, 469. 



Planets, new method of computing 

 the perturbations of, 140. 



Plants, on the signs of current elec- 

 tricity manifested in, during vege- 

 tation, 36. 



Polynomial functions, on, 119. 



Pratt (J. H.) on the supernumerary 

 bows in the rainbow, 78. 



Pringle (W.) on a pecuharity observed 

 in a luminous arch, 308. 



Pritchard (Rev. Mr.) on processes for 

 rendering quicksilver tremorless for 

 astronomical observation, 464. 



Pseudoscope, description of anew, 442. 



Quaternions, on continued fractions 

 in, 117,236,321. 



Quetelet (A.) on the periods of revo- 

 lution of the satellites of Jupiter 

 and Saturn, 309. 



Quicksilver, processes for rendering, 

 tremorless, 464. 



Rainbow, on the supernumerary bows 

 in the, 78; observations on the, 439. 



Rammelsberg (Prof.) on chiviatite, 

 457. 



Rankine (W. J. M.) on the mechani- 

 cal effect of heat and of chemical 



.^ forces, 6; on the general law of 

 the transformation of energy, 106 ; 

 ■ on the mechanical theory of heat, 

 437, 483. 



Regnault (V.) on the specific heat of 

 elastic fluids, 473. 



Reich (F.) on the mean density of the 

 earth, 153. 



Heynoso (A.) on the presence of sugar 

 in the urine of epileptic patients, 



'7/230. 



Roberts (J.) on the construction of 



i': new forms of instruments for the 

 correction of compass errors, and 



\q on the nature of the atti^ction of 

 iron on the poles of magnets, 61. 



Robertson (A. J.) on the theory of 

 waves, 133. 



Robierre (M.) on the per-centage of 



zinc in brass and bronze, and the 

 separation of zinc from copper, 230. 



Royal Astronomical Society, proceed- 

 ings of the, 140. 



Royal Institution of Great Britain, 

 proceedings of the, 218, 303, 381. 



Royal Society, proceedings of the, 61, 

 132,211,374,464. 



Rubiacic acid and salts, 426. 



Rubian and its products of decompo- 

 sition, researches on, 410, 496. 



Rubiretine,on the composition of, 4 14. 



Rutherford (W.) on the extension of 

 the value of the ratio of the cir- 

 cumference of a circle to its diame- 

 ter, 213. 



Sabine (Col. E.) on the periodic and 

 non-periodic variations of tempera- 

 ture at Toronto in Canada, 376. 



Satellites of Jupiter and Saturn, on 

 the periods of revolution of the, 

 309. 



Schunck (E.) on rubian and its pro- 

 ducts of decomposition, 410, 496. 



Sea-level, on changes of the, effected 

 by existing physical causes during 

 stated periods of time, 268. 



Secchi (Prof.) on the distribution of 

 heat at the surface of the sun, and 

 on lunar geology, 142. 



Slater (J. W.) on the chemical action 

 of light, 67. 



Sondhauss (C.) on the refraction of 

 sound, 73. 



Sound, on the refraction of, 73; on 

 the velocity of, in gases, 483. 



Stannaethylium, researches on, 60, 160. 



Steam, on the colours of a jet of, 28. 



Stevenson (W.) on auroral pheeno- 

 mena, 465. 



Sturm's theorem, on a remarkable 

 modification of, 446. 



Sugar, on the presence of, in the 

 urine of epileptic patients, 230. 



Sulphur, researches on the density of, 

 149. 



Sun, on the distribution of heat at 

 the surface of the, 142. 



Sun-spots, on the periodic return of 

 the minimum of, 67. 



Sylvester (J. J.) on polynomial func- 

 tions which admit of reduction in 

 the number of variables, 119; on 

 a rule for determining at sight the 

 degree of any symmetrical fiinction 

 of the roots of an equation expressed 

 in terms of the coefficients, 199; 

 on Aronhold's invariants, 299, 367; 



