INDEX. 
619 
of jalap, 342 ; XI. Resin of labdanum, 344 ; XII. Berengela resin, 346 ; XIII. Resin of retin- 
asphalt, 348 ; XIV. Ammoniac resin, 350 ; XV. Resin of opoponax, 352 ; XVI. Resin of 
assafoetida, 354; general remarks, 358. 
Resins , on the constitution of the. Part V., 361 ; XVII. Resin of sagapenum, ibid ; XVIII. Resin 
of galbanum, 362 ; XIX. Euphorbium resin, 364; XX. Elemi resin, 366; XXI. Resin of 
bdellium, 368 ; XXII. Resin of benzoin, 369 ; action of caustic lime on resin of benzoin, 372 ; 
action of caustic potash on resin of benzoin, 375 ; action of oxide of lead on resin of benzoin, 
378; on the rational constitution of the resin of benzoin, 380; general results in regard to 
the resin of benzoin, 383. 
Retin-asphalt , resin of, 348. 
S. 
Sabine (Major Edward, R.A.). Contributions to terrestrial magnetism, 129. § 1. Lines of 
inclination and intensity in the Atlantic, ibid. § 2. Lines of intensity between the Cape of 
Good Hope and Australia, 140. 
Sagapenum, resin of, 361. 
Sarcolemma, or tunic of the primitive fasciculus of voluntary muscle, 474. 
Scammony, resin of, 341. 
Shooting stars. An account of those of 1095 and 1243, 175. 
Solar spectrum, on the chemical action of the rays of the, on preparations of silver and other 
substances, both metallic and non-metallic, 1 ; chemical analysis of the, 15; phenomena ob- 
served on presenting particular preparations to the action of the, 27 ; effect of, on certain 
vegetable colours, 33 ; of the whitening power of the several rays under the influence of 
hydriodic salts, on papers variously prepared and previously darkened by the action of solar 
light, 35 ; analysis of the chemical rays, by absorbent media, 37 ; on the distribution of the 
calorific rays in the, 51. 
Speculum of a refecting telescope. Proportion of copper and tin in metal for, 505 ; method of 
forming a large speculum of several castings, ibid. ; process of casting, 509 ; processes of 
grinding and polishing, 514. 
Spectrum, prismatic, extension of the visible, 19; calorific, account of a process for rendering it 
visible, 52. 
Steel, strength of pillars of, 421, 430, 452. 
Strength of pillars. See pillars, iron, steel, timber. 
Sulivan (Lieut. B. J., R.N.). Table of observations by, of the dip and intensity, made at sea 
between Falmouth and the Falkland Islands, 142. 
Suns atmosphere, possible indication of absorptive action in the, 29. 
T. 
Tables of the elevation or depression of the surface of the sea above or below mean water at all 
hours of the tide, for Plymouth and Liverpool, 261 ; of observations at Plymouth when the 
surface passes certain fixed lines near mean water ; and the calculated time of high water, 
hence obtained, compared with the observed time, 262. 
Table of tide observations, at Petropaulofsk, 169 ; Port de Lloyd, 172 ; Port de la Coquille, 173 ; 
Sitkhce, 174. 
of, observations of the dip and intensity made at sea between Falmouth and the Falkland 
Islands, 142. 
of observations of the dip and intensity made at sea in a voyage from England to Austra- 
lia, 146. 
