355 



Flood at Frastanz, in the Vorarlberg, 

 notices of a, in the autumn of 184G, 

 162. 



Fluoride of calcium, on the solubility 

 of, in water, and the relation of this 

 property to the occurrence of that 

 substance in minerals, and on recent 

 fossil plants and animals, 91. 



Fluoride of calcium present in the Bal- 

 tic, on the proportion of, 302. 



Fluorine in the bones from Arthur's 

 Seat, on the existence of, 88. 



remarks on the presence of, 



in different ocean waters, 302. 



Fluor-spar of Arden, on the, 159. 



Forbes (Prof.) on a possible expla- 

 nation of the adaptation of the eye 

 to distant vision at different dis- 

 tances, 6. 



note on the crystalline lens, 9. 



notes on the topography and 



geology of the CuchuUin lIUls in 

 Skye ; and on the traces of ancient 

 glaciers which they present, 50, 54. 



Biographical notice of the 



late Sir John liobison, K.II., Sec. 

 R.S.E., 68. 



New observation on the gla- 



ciers of Savoy, 103-107. 



Account of a geological ex- 



amination of the volcanoes of the 

 Vivarais, 158. 



on an instrument for measur- 



ing the extensibility of elastic solids, 

 173. 



Note respecting the refrac- 



tive and dispersive power of chloro- 

 form, 187. 



Observations on the commu- 



nications of Messrs Milward and 

 Strachey on glaciers, and especially 

 on the cause of the annual rings of 

 glaciers, 196. 

 on the classification of co- 



lour, 190, 214. 



Note regarding an experi- 

 ment suggested by Professor Kobi- 

 Bon, 244. 



Note respecting the dimen- 



sions and refracting "power of the 

 eye, 251. 



on the intensity of heat re- 



flected from glass, 256. 



on the volcanic formations 



of the Alban Hills, near Rome, 259. 

 Account of a remarkable 



meteor, seen on 19th December 

 1849, 309. 



A few remarks suggested by 



Professor Forbes' description of the 

 effects of glacial action among the 



Cuchullin Hills, and Mr Maclaren's 



views of the facts observed by him 



at the Gareloch, 65. 

 Forchammer (Prof.) on the proportion 



of fluoride of calcium present in the 



Baltic, 302. 

 Fossils of the lias formation, from 



South Africa, verbal communica- 

 tion on, 133. 

 Frastanz, in the Vorarlberg, notices 



of a flood at, in the autumn of 1846, 



162. 

 Freezing-point of water, the effect of 



pressure in lowering the, 267. 



See water, freezing-point of. 



Gamboge tree of Siam, on the, 263. 



from the Wynaad, on a new 



variety of, 58. 



Gases, dry, on the action of the, on or- 

 ganic colouring matters, and its 

 relation to the theory of bleaching, 

 183. 



Glaciers, " dirt-bands" of. See " Dirt- 

 Bands" of glaciers. 



annual rings of, observations 



on the cause of, 196. 



analogy of the structure of, 



with that of volcanic rocks, 17. 



viscous theory of, 19. 



Himalayan, on the rate of 



progression of the, 196. 



of Savoy, new observations 



on the, 103-107. 



Glass, intensity of heat reflected from, 

 256. 



Goldielands, in Roxburghshire, im- 

 pressions on the surface of certain 

 strata of greywacke schist at, 217. 



Goodsir (Prof.) Observations on the 

 electrical organs of the rays, 9. 



Verbal notices respecting the 



thyroid, thymus, and supra-renal 

 bodies, 80. 



Gordon (Prof.) Letter on the viscous 

 theory of glaciers, 19. 



Gregory (William) M.D., on the ex- 

 traction of pure phosphoric acid 

 from bones, and on a new and ano- 

 malous phosphate of magnesia, 25. 



on the chemical relations of 



creosote, 45. 



on the presumed long-con- 

 tinued presence of arsenic in the 

 human stomach, 110. 



Chemical notices (1.) on a 



fatty substance derived from animal 

 matter ; (2.) on a black powder 

 which appeared on the surface of 

 Loch Dochart on the morning of 

 23d November 1846, 129; (3; on 



