INDEX. 



559 



Orcine, on the composition of, 1, 322. 



Orsellic acid, observations on, 250. 



Pelargonic acid, on the preparation 

 and properties of, 1 66. 



Pellat (A.) on annealing flint-glass, 64. 



Periodic series, on the critical values 

 of the sums of, 309. 



Persoz (M.) on the formation of hy- 

 ponitrite of silver, 75. 



Petinine, on the preparation and pro- 

 perties of, 181. 



Phillips (Reuben) on volta-electric in- 

 duction, 260 ; on the passive state 

 of iron, 509. 



Phillips (Richard) on the spontaneous 

 cohesion of the particles of alumina, 

 357. 



Photographometer, description of the, 

 329. 



Picoline, on the preparation and pro- 

 perties of, 185. 



Pierre (I.) on the combinations of 

 silicium, 162. 



Planet, on a method of calculating 

 the orbit of a, 71 ; on an easy me- 

 thod of approximating to the di- 

 stance of a, 24 1 . 



Planetary perturbations, on a parti- 

 cular transformation of the differ- 

 ential equations of motion in the 

 theory of, 95. 



Pliicker (M.) on diamagnetism, 48. 



Pluquaternions, on, 447, 494. 



Porter, on the amount of inorganic 

 constituents contained in, 341. 



Portlock (Lieut. -Colonel) on the abs- 

 ence of any traces of the fall of 

 aerolites and of glacial action in the 

 strata formed before the last great 

 modification of the earth's surface, 

 337. 



Potash, on the preparation of the 

 meta-antimoniate of, 324. 



Powell (Rev. B.) on a new case of the 

 interference of light, 155. 



Pringle (W.) on the duration of a solar 

 spot, 460. 



Pseudoquinine, on the preparation 



and composition of, 323. 

 Quadratic moduli, on some forms of, 

 45. 



Quaternions, or a new system of ima- 

 ginaries in algebra, on, 58 ; on the 

 application of, to the theory of ro- 

 tation, 196; notes on, 278; on 

 certain functions resembling, 435. 



Quinine, on the phosphate of, 164. 

 Rees (Dr. G. O.) on a function of the 

 red corpuscles of the blood, 28, 

 34. 

 Reviews: — Sir John HerschePs Re- 

 sults of Observations made at the 

 Cape of Good Hope, 145, 231, 296 ; 

 Bell's Elements of Euclid, 154; 

 Johnston's Physical Atlas, 392; 

 Strickland and Melville's Dodo and 

 its Kindred, 467 ; Weld's History 

 of the Royal Society, 472 ; Ryffel's 

 Calculating Cubes, 551. 



Roccella tinctoria, on the substances 

 discovered in, 249. 



Royal Society, proceedings of the, 60, 

 155, 548. 



Royal Astronomical Society, proceed- 

 ings of the, 66, 159, 237, 477. 



Rubiacic acid, preparation and pro- 

 perties of, 135, 141. 



Rubiacine, observations on, 139. 



Rubian, preparation and properties of, 

 134. 



Rue, on the essential oil of, 166. 



Ryffel's Calculating Cubes, notice re- 

 specting, 551. 



Saturn, on the satellites of, 66, 303 ; 

 discovery of a new satellite of, 

 477. 



Schunck (Dr.) on colouring matters, 

 133; on the substances discovered 

 in the Roccella tinctoria and Ever- 

 nia Prunastri, 249. 



Shortrede (Capt.) on the transit in- 

 strument at the Bombay observa- 

 tory, 73 ; on a formula for reducing 

 observations, 242. 



Silicium, on the combinations of, 

 162. 



Silver, on the formation of hyponitrite 

 of, 75. 



Sines, on some methods of developing 

 any function of, 106. 



Smith (L.) on two new minerals, Med- 

 jidite and Liebigite, 79. 



Society of the Friends of the Natural 

 Sciences of Vienna, proceedings of 

 the, 398. 



Soda, on a test for, 324. 



Solar spots, observations of, 305 ; on 

 the duration of, 460, 480. 



Sound, on the velocity of, 98 ; on the 

 theory of, 349, 462. 



Spheroidal state, observations on the, 

 439. 



