I N D E X. 



551 



Picro-erythrine, on the composition 



of, 302. 

 Pimaric acid, on the constitution of, 



542. 

 Pinic acid, researches on, 542. 

 Piria (M.) on the preparation and 

 chemical constitution of asparagin, 

 233 ; on the action of acids and 

 alkalies on asparagin and aspartic 

 acid, 317. 

 Planets, results deduced from the oc- 



cultations of, 146. 

 Plateau (M.) on figures of equilibrium 

 of a liquid mass withdrawn from 

 the action of gravit}', 61. 

 Polarizing microscope, on the distinct- 

 ness of vision produced by, 161. 

 Potts' (R.) Euclid's Elements of Geo- 

 metry, notice of, 69. 

 Powell (Rev. Prof. B.) on beads in 



annular eclipses, 145. 

 Pringle (W.) on a remarkable solar 



spot, 232, 308. 

 Propionic acid, 156. 

 Pseudo-orcine, on the preparation 



and composition of, 302. 

 Quaternions, a new system of imagi- 



naries in algebra, on, 367. 

 Ragona-Scina (Prof.) on the solar 



spectrum, 505. 

 Reviews : — Potts' Euclid's Elements of 

 Geometry, 69 ; Gaskin's Solutions 

 of Trigonometrical Problems, ib. ; 

 Solutions of Geometrical Problems, 

 ib. ; Dr. Daubeny's Description of 

 Active and Extinct Volcanos, 216, 

 296 ; Capt. Yollond's Account of 

 the Measurement of the J^ough 

 Foyle Base in Ireland, 287 ; Sir 

 John Herschel's Results of Astro- 

 nomical Observations made at the 

 Cape of Good Mope, 367, 518 ; 

 Bell's Elements of Plane Geome- 

 try, 526 ; Tate's Principles of Geo- 

 metry, 535. 

 Roberts (S.) on the development of 

 functions of the form F(z + x), 284. 

 Roccellinine, on the composition of, 



301. 

 Rocks, influence of internal pressure 

 on the production of laminated 

 structure in, 141. 

 Rose (Prof. H.) on the composition 

 cf urano-tantalite and columbite, 

 77 ; on a new method of estima- 

 ting arsenic, antimony and tin, 394. 



Royal Astronomical Society, proceed- 

 ings of the, 144. 

 Royal Society, proceedings of the, 



139, 219, 300, 389, 537. 

 Saint-Evre (M.) on the action of 

 chlorine on benzoate of potash, 149. 

 Salvetat (M.) on a hydrated silicate 



of alumina, 149- 

 Selenium, on the presence of, in iodide 



of potassium, 397. 

 Shooting stars, researches on, 81, 



170, 349. 

 Shortrede (Capt.) on a formula for 



the elastic force of vapour, at dif- 

 ferent temperatures, 303 ; on the 



moist-bulb problem, 305. 

 Solar radiation, on different proper- 

 ties of, 88. 

 Salar spot, notice of a remarkable, 



232, 308. 

 Solar spectrum, on the elementary 



colours of the, 262, 489 ; on some 



new lines in the, 499- 

 Sound, theoretical determination of 



the velocity of, 276, 339, 494. 

 Spectrum, on the elementary colours 



of the, 489. 

 Stars, results deduced from the occul- 



tations of, 146 ; double, of the 



southern hemisphere, on the, 518. 

 Stenhouse (Dr. J.) on the proximate 



principles of the lichens, 300. 

 Stokes (G. G.) on the constitution of 



the luminiferous sether, 343. 

 Strickland (H. E.) on the present 



state of knowledge of the geology 



of Asia Minor, 137- 

 Strychnia, on a reagent for, 396. 

 Sulphur, on the acids of, 75. 

 Sylvic acid, on the constitution of, 



542. 

 Tate's (Thomas) Principles of Geo- 

 metry, &c., reviewed, 535. 

 Taylor's theorem, observations on, 98. 

 Tcschemaclier (J. E.) on the fossil 



vegetation of anthracite coal, 78. 

 Thenard (M. P.) on phosphorus, 153. 

 Theorems of Maclaurin and Taylor, 



on the combination of the, 98. 

 ITiomson (Dr. R. D.) on the law of 



the nutrition of animals, 456. 

 Tides, researches on, 139 ; report on 



experiments made on the, in the 



Irish Sea, 538. 

 Tin, on a new method of estimating, 



394. 



