Index. 403 



Forbes, Professor, on the eflfect of snow in apparently increasing the 



force of solar radiation, 170. 

 . on the movement and structure of the Mer de Glace 



of Chamouni, 380. 



Galbraith, Wm., A.M., on the English arc of the meridian, 263. 



Geokronite, new locality of, 183. 



Geological chronometer, 385. 



Glaciers, on the structure, formation, and movement of, by Dr James 

 Stark, 171 — on the glacier theory, 1 ; and the discovery of 

 the structure of glaciers, by Professor Forbes, 133 — on some 

 phenomena of glaciers, by Sir John Herschel, 14. 



Gold-mines in Ireland, 386. 



Gold, large mass found in the Ourals, 386. r- I •-..«_ '\ \ S 



Granite, its cutting and polishing, as effected at Aberdeen, by Messrs 

 Macdonald and Leslie, described, 341. 



Greenockite, account of, 183. 



Grooved and polished surfaces at the contact of ancient secondary 

 strata, by Professor Rogers, 178. 



Guano of commerce, Dr Mathie Hamilton's account of it, 389. 



Hamilton, Mathie, M.D., on the Llama, Alpaca, Guanaco, and 



Vicuna, 285. 

 Harbours of refuge on the east coast of Scotland, by John Fleming, 



D.D., 306. 

 Helices pierce calcareous rocks, 186. 

 Herschel, new comet discovered by, 393. 

 Holy Land, heights of mountains in, determined barometrically, by 



M. Russegger, 179. * 

 Humboldt, Baron, on the heights of continents, 326. 

 his Fragmens Asiatiques, announced, 179. 



Ignis Fatuus observed near Bologna, 383. 

 Isinglass, Indian, remarks on, 189. 



Khiva, variation of temperature during Russian expedition to, 380. 



Lapis Lazuli, nature of its blue colour, 183. 



Llama, Alpaca, Guanaco, and Vicuna, described by Dr Mathie 

 Hamilton, 285. 



Mer de Glace of Chamouni, Professor Forbes on its movement and 



structure, 380. 

 Meteorological Tables, 161, 364. 

 Milne, David, Esq. F.R.y.E., on Earthquakes, 85. 



