SECTIONS. INDEX OF SUBJECTS. 



309 



Signals, telegrapliic time, by C. V. Walker, 

 1852, 131. 



, time, on the transmission of, by Prof. 



9. P. Smyth, 1855, 29. 



Silica, J. Jeffreys on a hoar frost of, 1840, 125. 



and alumina. Prof. Chapman on the 



isomorphous relations of, 1850, 50. 



Silicates, on the action of saline solutions 

 on, under the influence of heat and pres- 

 siu-e, by Prof. W. K. SulHvan, 1857, 59. 



-, metallic, on the action of sulphurets on, 



at high temperatures,by D.Forbes, 1855,62. 



, soluble, and some of their applica- 

 tions, F. Eansome on, 1859, 78. 



Siliceous deposits in the chalk formation, J. S. 

 Bower bank on the origin of the, 1856, 63. 



Silicon from paracyanogen, Dr. Brown's ex- 

 periments on the production of, 1841, 



54-. 

 in meteoric iron, Dr. C. U. Shepard on 



the existence of, 1839, 55. 

 Silk, W. Felkin on an experiment on the 



growth of, at Nottingham, 1839, 87. 

 , W. Felkin on its cultivation in Ilin- 



dostan, 1839, 88. 

 , on the growth of, in England, by 



Mrs. Whitby, 1846, 87; 1849, 81. 

 , on machinery for spinning, from the 



cocoon, by B. A. Murray, 1857, 189. 



manufacture of Ireland, Dr. W. C. 



Taylor on the, 1843, 89. 



Silk-trees, or Bombaceos, of Western India, 

 on some peculiarities of the, by Dr. G. 

 Buist, 1859, 132. 



Silkworm, on the cultivation of the, in En- 

 gland, by Mrs. Whitby, 1844, 73. 



, on its occurrence in a wild state in this 



country, by Eev. F. F. Statham, 1858, 130. 



Silurian anthracite of Cavan, Prof. Whitty 

 on the, 1854, 95. 



districts of Ireland, Sir E. Griffith on 



the, 1843, 46 ; 1844, 46. 



fossils, J. W. Salter on the structure 



and relations of Cornulites and other 

 allied, 1845, 57. 



fossils, J. W. Salter on a few genera 



of, 1852, 59. 



— — formation, upper, in the Yale of Llan- 

 gollen, J. E. Bowman on the, 1840, 100. 



formation, lower, in North Wales, on 



the stratification of the igneous and sedi- 

 mentary rocks of the, by A. Dean, 1844,56. 



formation in the district of Wilsdruff, 



Saxony, Dr. Geinitz on the, 1860, 79. 



limestone of Hay Head, Staffordshire, 



Prof. Buckman on the age of the, 1846, 61. 



< and metamorphic rocks of the south 



of Norway, on the relations of the, by 

 D. Forbes, 1855, 82. 



rocks of Bohemia, Sir E. I. Murchison 



on the, 1850, 97 ; Trilobites of, 99, 



• rocks in the vicinity of Builth, Sir H. 



T. De la Beche on a section through the, 

 1844, 46. 



rocks of Ireland, Sir E. Griffith on 



the, 1852, 47. 



Silurian rocks in the county of Tyrone, Col. 

 Portlock on the, 1838, 84. 



rocks at Ober and Neu Schmollen, near 



. Breslau, Silesia, F. Oswald on the, with re- 

 marks by Sir E. I. Murchison, 1845, 47. 



rocfis of Eussia, Sir E. I. Murchison 



on the, 1840, 106. 



rocks, the new red sandstone, and the 



coal-measures of the South Staffordshire 

 coal-field, J. B. Jukes on the relations 

 between the, 1849, 55. 



— — rocks in Westmoreland, J. G. Mar- 

 shall on a section across the, 1839, 67. 



rocks, lower, of Scandinavia and.Eus- 



. sia. Sir E. I. Murchison on the, 1844, 53. 



rocks, lower, of the south of Scotland, 



Prof. Harkness on the fossil remains of 

 the, 1852, 48. 



rocks, lower, discovery of microscopic 



shells in the, 1854, 82. 



rocks, lower, of the North-western 



Highlands of Scotland, Sir E. I. Murchi- 

 son on the, 1857, 82. 



rocks, lower and upper, of Canada, J. 



W. Salter on the fossils of the, 1851, 63. 



— — rocks, upper, of Denbighshire, J. E. 

 Bowman on the, 1841, 59. 



schists, lower, A. Gages on the trans- 

 formation of iron pyrites connected with 

 fossil graptolites from Tinnaglough, co. 

 Wexford, 1860, 79. 



strata, upper. Prof. Buckman on the 



discovery of a new species of Hypantho- 

 crinite in the, 1846, 61. 



and Cambrian systems, Eev.Prof. Sedg- 

 wick andSirE.I.Murchison on the,1835, 59. 



system of strata. Sir E. I. Murchison 



on the, 1838, 80. 



system. Sir E. I. Murchison on the 



fishes of the upper beds of the, 1837, 91. 



Silurio-Devonian strata of Scotland, on the 

 paljeontology of the, by D. Page, 1858, 104. 



Silver, its price of late years does not afford 

 an accurate measure of the value of gold, 

 by Prof. E. H. Walsh, 1855, 198. 



, on the export of, to the East, by Prof. 



E. H. Walsh, 1856, 161. 



, new process for its extraction from 



lead, by H. L. Pattinson, 1838, 50. 



ores, on the theory and practice of 



amalgamation of, in Mexico and Peru, by 

 J. C. Bowring, 1844, 28. 



, ammonio -iodide of, Eev. J. B. Eeade 



on, 1857, 56. 



■ , crystals of, T. E. Blackwall on the pro- 

 duction of, 1838, 74. 



, iodide of, E. Hunt on the influence of 



the ferrocyanate of potash on the, as a 

 photographic preparation, 1841, 47. 



, molybdic, notice of, 1841, 58. 



— — , nitrate of, blackened by light, E. Scan- 

 Ian on, 1838, 63. 



, nitrate of, as a caustic and therapeutic 



agent, Dr. E. D. Thomson on, 1838, 132. 



Sinapis cheiranthus, Koch, new to the Eng- 

 lish flora, 1839, 92. 



