354 ON ALLUVIAL FORMATIONS. 



would form a flood which would sweep across the sand- 

 stone mountains, between the Alps and the Jura range, 

 and even ascend high on the Jura itself. This flood of 

 water, moving, probably, at the rate of 200 feet in a se- 

 cond, and loaded with debris of rocks, would carry 

 masses, even these having a magnitude of 50,000 cubi- 

 cal feet, some thousand feet high, on the Jura range *. 

 Geologists maintain, that the blocks or boulders met with 

 in other countries, and arranged as those in Switzerland, 

 have been deposited where we now find them, by the 

 bursting of lakes ; while those found on the shores of the 

 Baltic, are conjectured to have been transported by a 

 great rush of water caused by the sudden elevation of the 

 land of Scandinavia. Another opinion has its advocates, 

 which maintains that these boulders have been spread* over 

 different countries by the waters of the deluge. 



NOTE F, p. 26. 



ON THE ALLUVIAL LAND OF THE DANISH ISLANDS IN 

 THE BALTIC, AND ON THE COAST OF SLESWIGH. 



IN this section, Cuvier gives a clear and distinct ac- 

 count of several kinds of alluvial formations. M. De 

 Luc, in the first volume of his Geological Travels, de- 

 scribes the alluvial formations that cover and bound 

 many of the islands in the Baltic, and upon the coast of 

 Denmark, and gives so interesting an account of the 

 modes followed by the inhabitants, in preserving these 

 alluvial deposites, that we feel pleasure in communicat- 

 ing it to our readers. 



* In Silliman's American Journal there are many interesting de- 

 tails in regard to the distribution of boulders in the northern parts 

 of North America. 



