INDEX. 



463 



Mineralogical notes, 115. 



Minerals, on the classification of, 175; 

 on the artificial formation of, 453. 



Molecular influences, observations on, 

 121. 



Molybdate of lead, on a red variety 

 of, 236. 



Moon's mean motion, on the secular 

 variation of the, 223. 



Morgan (Prof. De) on the principle 

 of mean values, 69. 



Muscular fibril, on the structure of 

 the, 364. 



Nickel, on the passive state of, 454. 



Nickles (M. J.) on the passive state 

 of nickel and cobalt, 454. 



Nitric acid, on a new test for, 13. 



Nitro-prussides, on some new methods 

 of forming the, 1 1 . 



Northcote (A, B.) on an analysis of 

 auriferous quartz, 390. 



Olefiant gas,on the origin of tar in, 420. 



Othyle theory, observations on the, 

 89, 418. 



Ovum, on the penetration of sperma- 

 tozoa into the interior of the, 65. 



Oxygen, on the electro-chemical de- 

 portment of, 241. 



Ozone, on the nature of, 51. 



Pendulum, on a proposed barometric, 

 432. 



Photography, on the application of, 

 to the study of certain phenomena 

 of polarization, 73. 



Planetary perturbation, new solution 

 of the problem of, 378. 



Polarization, on certain phenomena 

 of, 73, 107. 



Polygon, on the porism of the in-and- 

 circumscribed, 99, 377- 



Potter (Prof.) on the fourth law of 

 the relations of the elastic force, 

 density, and temperature of gases, 

 161. 



Power (J.) on the theory of the re- 

 ciprocal action between the solar 

 rays and the different media by 

 which they are reflected, refracted 

 or absorbed, 219. 



Probabilities, on a question in the 

 theory of, 259. 



Propionic acid and salts, 95, 204. 



Quartz, on the optical phenomena 

 and crystallization of, within mica, 

 amethyst and topaz, 265 ; analysis 

 of auriferous, 390. 



Quetelet (M. A.) on lunar circles, 

 448. 



Quinine and quinidine, on the disco- 

 very of, in the urine, 171. 



Rammelsberg (Prof.) on selenide of 

 mercury from the Hartz, 272. 



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

 tion of the law of the conservation 

 of energy to the determination of 

 the magnetic meridian on board 

 ship, when out of reach or out of 

 sight of land, 140; on an oscil- 

 latory theory of light, 403; on a 

 proposed barometric pendulum, for 

 the registration of the mean atmo- 

 spheric pressure during long periods 

 of time, 432. 



Royal Astronomical Society, proceed- 

 ings of the, 378. 



Royal Institution of Great Britain, 

 proceedings of the, 150, 230, 307. 



Roval Society, proceedings of the, 63, 

 140, 214, 300. 



Rubian, on the constitution of, 187- 



Scheeletine, analysis of, 120. 



Schunck (E.) on the constitution of 

 the colouring matters of madder, 

 187. 



Soundings, instrument for taking, 

 344. 



Spermatozoa, on the penetration of, 

 into the interior of the ovum, 65. 



Spinal chord, on certain functions of 

 the, 66. 



Staurolite, observations on, 115. 



Stevenson (W.), abstract of observa- 

 tions on the aurora, cirri, &c. made 

 at Dunse, 20. 



Stokes (G. G.) on the cause of the 

 occurrence of abnormal figures in 

 photographic impressions of po- 

 larized rings, 107 ; on the change 

 of refrangibility of light, 304 ; on 

 the metallic reflexion exhibited by 

 certain non-metallic substances, 

 393. 



Sturm's theorem, observations on, 

 14, 293, 300. 



Sun-columns, observations on, 78. 



Sutherland (Dr. P. C.) on currents in 

 the Arctic seas, 141. 



Sylvester (J. J.) on a remarkable mo- 

 dification of Sturm's theorem, and 

 on a new rule for finding superior 

 and inferior limits to the roots of 

 an equation, 14, 138, 210; on 

 the algebraical theory of the secu- 

 lar-inequality determinantive equa- 

 tion, 214; on the explicit va- 

 lues of Sturm's quotients, 293 ; on 



