107 



and Southern portions of that Kingdom. By Sir Koderick 



Inipey Murchison. — By the Author. 

 Address to the British Association for the Advancement of Science, 



September 10, 1846. By Sir Roderick Impey Murchison, 



President. — By the Author. 

 Det Kongelige Danske Videnskabernes Selskabs Naturvidenskaba- 



lige og Mathematiske Afhandlinger. Deel XI. 

 Do. Do. Do. 



Historiske og Philosophiske Afhandlinger. Deel VII. — By the 



Royal Society of Sciences of Copenhagen. 

 Mnemonic Dictionary of Languages, arranged in Mnemonic Tables. 



By A. .Tazwinski, Doctor in Philosophy. — By the Author. 



Monday, 21si December 1846. 



Sir GEORGE S. MACKENZIE, Bart., V.P., in the Chair. 



The following Communications were read : — 



1. New Observations on the Glaciers of Savoy, (concluded). 

 By Professor Forbes. 



The Second Part of this paper contained an account of the 

 determination of the motions of several glaciers which had not 

 been before observed, such as the glacier of Talefre, Nant Blanc, 

 Miage, and Brenva, and the results of a comparison of the measures 

 made in 1846 with those of former years, at different points of 

 the Mer de Glace ; shewing the unusual speed of motion during 

 last summer. There is detailed also the history of the loss of a 

 knapsack in the ice of the glacier of Talefre in 1836, and the 

 recovery of its fragments in 1846, shewing a motion of 4300 feet 

 in ten years, on a declivity of about 15° at a mean. Some remarks 

 were then made on the process of the conversion of the neve into 

 glacier, which the author ascribes entirely to intense pressure and 

 friction, aided by the molecular influences which time develops. 

 The first stage of glacification is the formation of the blue bands, 

 nearly vertical, which are due to the friction arising from the differ- 

 ential motion of the particles. The paper concludes by some re- 

 marks on the apparent ejection of stones and other foreign bodies 

 from glaciers. 



