I N D E X. 



551 



Pendulum experiments, account of, 



272. 

 Penny (Dr.) on the chloride of arsenic, 

 and on the detection of arsenic in 

 cases of poisoning, 361. 

 Perrins (J. D.) on the occurrence of 

 l)erberine in the Columba wood of 

 Ceylon, 99. 

 Phillips (R.) on the electrical condi- 

 tion of the atmosphere, 126; on 

 the colours of a jet of steam, 128. 

 Polygons and pol3hedrons,onStaudt's 

 theorems concerning the contents 

 of, 335. 

 Polynomials, homogeneous quadratic, 



observations on, 138. 



Powell (Rev. B.), on Lord Brougham's 



" Experiments and Observations on 



the properties of Light," 1 . 



Pyromeconic acid, on some salts and 



products of decomposition of, 161. 



Pyrometer, description of a new, 157. 



Quaternions, on continued fractions 



in, 303. 

 Quetelet (A.) on atmospheric elec- 

 tricity, 249 ; on the state of static 

 and of djmamic electricity observed 

 during some heavy showers, 253. 

 Quinine, chemical constitution and 

 atomic weight of the new polarizing 

 crjstals produced from, 186. 

 Rain-water collected at the Observ'a- 

 tory at Paris, chemical examination 

 of the, 396. 

 Rammelsberg (Prof.) on the chemical 



constitution of Childrenite, 118. 

 Raukine (W. J. M.) on the causes of 

 the excess of the mean temperature 

 of rivers above that of the atmo- 

 sphere, 355; on the reconcentra- 

 tion of the mechanical energy of the 

 universe, 358 ; on the non-polari- 

 zation of the aurora borealis, 452. 

 Resin, on a new fossil, 261. 

 Reslhuber (P. A.) on the decennial 

 period in the magnitude of the 

 diurnal motion of the magnetic 

 needle, 219. 

 Royal Society, proceedings of the, 



147, 230, 306, 381, 465. 

 Rubian, researches on, 4/2. 

 Sabine (Col.E.) on periodical laws dis- 

 coverable in the mean effects of the 

 larger magnetic disturbances, 2.S2. 

 Schaftner (Max.) on an apparatus for 

 the determination of carbonic acid, 

 317. 



Schonbein (C. F.) on the indirect 

 bleaching power of mercury and of 

 stibaethyle, 238 ; on the nature and 

 name of ozone, 542 ; on the quan- 

 titative determination of ozone, 545. 

 Schunck (E.) on rubian and its pro- 

 ducts of decomposition, 472. 

 Seleretinite, on the composition of, 2G1 . 

 Silver, on the preparation of pure, 

 from the chloride, 78 ; on the per- 

 o.xide of, 318. 

 Smith (J. D.) on early Egyptian che- 

 mistry, 142. 

 Smyth's (Capt. W. H.) ^des Ilart- 



wellianee, reviewed, 69. 

 Snooke's (W.D.) Astronomical Tables 

 for the Calculation of Echpses, no- 

 ticed, 537. 

 Solar light, new analysis of, 401. 

 Squares, on a theorem relating to the 



products of sums of, 515. 

 Stalactites and stalagmites, on the 

 existence of organic matter in, 155. 

 Stars, on the colours of double, 71 ; 

 investigation of the orbit of y Vn- 

 ginis, 73. 

 Staudt's (M.) theorems concerning 

 the contents of polygons and poly- 

 hedrons, observations on, 335. 

 Steam, on the colours of a jet of, 128, 



416. 

 Stearophanic acid, on the composition 

 of, 21 ; occurrence of, in human 

 fat, 75. 

 Steel, Indian, on the composition of, 



42. 

 Steiner's extension of Malfatti's pro- 

 blem, researches connected with, 

 465. 

 Stereoscopic combination of colours-, 



on the, 241. 

 Stibffithyle, on the indirect bleaching- 



power of, 239. 

 Stokes (G. G.) on the change of rc- 



frangibility of light, 388. 

 Sulphurets decomposable by water, 



researches on the, 153. 

 Swale's merits as a geometer, ob- 

 servations on, 28, 201. 

 Sylvester (J. J.) on homogeneous 

 quadratic polynomials, 138 j on 

 Staudt's theorems concerning the 

 contents of polygons and polyhe- 

 drons, 335 ; on a simple geometri- 

 cal problem, 366. 

 Symmetric products, on the method 

 ■ of, 492. 



