On the Geology of Scandinavia and Spitzbergen. 387. 

 Vauquelin gives the following analysis of 5 grammes :-^ 



Silica, . , . . . 2.00 



Alumina, ..... 0.67 



Iron and Manganese, . . . 1.35 



Lime andMagnesia, .... 0.40 

 Sulphur ^ 



Chrome,' (_ .... 0.58 



Copper, C . 



Potassa. J 5.00 



It differs from other aerolites chiefly in containing no nickel, 

 but traces of copper and potassa (Ann. de Chimie, xviii. 421). 

 It is not magnetic. 



I find its specific gravity to be 3,122 at 52'. 



Observations on the Geology of Scandinavia and Spitzbergen. 

 By M. Eugene Robert. Communicated to the Imperial 

 Academy of Sciences of St Petersburgh.* 



M. de Struve communicated, on the 11th January, the fol- 

 lowing abridged view of the geological observations made by 

 M. Eugene Robert in Scandinavia and Spitzbergen, during 

 the expedition of the French corvette la Becherche in 1838. 



This geologist first directed his attention to the constitu- 

 tion of the islands of Denmark and Holstein. He ascribes 

 their formation to marine currents, a cause still in operation, 

 and which may ultimately wholly obliterate the Sound and 

 the Belts, and by so doing, convert the Baltic into a Caspian 

 Sea. He adduces in support of hi-, theory, 1*^, The point of 

 Skagens Udde in Jutland, which perfectly represents, in the 

 Gulf of Christiania, one of those s ilient angles formed by the 

 land gaining upon the water in proportion as the latter re- 

 cedes. 2d, The Island of Jomfrul ind on the east side of Nor- 

 way, which is gradually continuir g to extend itself, and re- 

 presents very correctly, by its loigthened form and composi- 

 tion, the Aasar of Sweden, which M. Robert ascribes to the 

 same phenomenon. With regard to the great blocks contained 

 in these alluvial deposits, he is of opinion, that they have been 



* " L'liwtltut," leth January 1840. 



