188 Dr. Borré’s Notices of Foreign Geology. 
If. Foreien. 
i. Dr. Borré’s notices of European Continental Geology, 
with remarks on the prevailing geological arrangements 
in a@ letter to Dr. J. ly. Webster of Boston—commumca- 
ted by him— 
To the Editor, 
Dear Sir, 
T send you the following extract from a letter I have 
received from Dr. Borré, whose essay on the Geology of 
Scotland has been so favorably received in Europe. 
**} 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 gneiss 
no where, even at Freyberg is there a perfect mantle sha- 
ped stratification; the granite cuts the strata every where, 
and formsveins 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 wacké. 
Some masses of Sienite have protruded through this forma- 
tion, aud nearly all the Sienites known, are newer than the 
, 
grau wacke, or at least than a great part of it. This is gea- 
of Dresden 
metalliferous Sienites of Hungaria which contain small veins 
limestone, of coral banks, and of Huttonian masses, or lay- 
ers of greenstone with augite. (The encrinal limestone of 
