188 Dr. Borre's Notices of Foreign Geology. 



II. Foreign. 



1. Dr. Borre's notices of European Continental Geologi/, 

 with remarks on the prevailing geological arrangements 

 in a letter to Dr. J. W. Webster of Boston — communica- 

 ted by him — 



To the Editor. 

 Dear Sir^ 



I send you the following extract from a letter I have 

 received from Dr. Borre, whose essay on the Geology of 

 Scotland has been so favorably received in Europe. 



"1 have been in the northern and southern parts of Ger- 

 many and in the Hungarian empire. I have only room to 

 tell you the principal results of my travels, without being 

 able to enter into sufficient proofs of the correctness of my 

 opinions, these you will soon learn through the medium of 

 some of our public Journals. First, the primitive class of 

 rocks contains two kinds of rocks, viz. mica slate and gtieiss ; 

 no where, even at Freyberg is there a perfect mantle sha- 

 ped stratification ; the granite cuts the strata every where, 

 and forms veins in it, it is in fact a posterior Huttonian rock, 

 perhaps even of the transition period. There is certainly 

 no decidedly primitive granite. 



The transition class contains the slate formation associa- 

 ted with quartzose and chloritose rocks, and grau wacke. 

 Some masses of Sienite have protruded through this forma- 

 tion, and nearly all the Sienites known, are newer than the 

 grau wacke, or at least than a great part of it. This is gen- 

 erally acknowledged now at Freyberg as regards the Sienite 

 of Dresden, Weissen, &c. To these Sienites belong the 

 metalliferous Sienites of Hungaria which contain small veins 

 of silver and gold, and are also impregnated with these 

 metals Most of the metalliferous veins seem to belong to 

 the same age, and to have been filled in part from below 

 and in part from above. Every where the theory of Wer- 

 ner is in fault, even at Freyberg it is falling down rapidly, 

 now that its author is dead. 



In the latter part of the transition series are masses of 

 limestone, of coral banks, and of Huttonian masses, or lay- 

 ers of greenstone with augite. (The encrinal limestone of 



