THE SCANDINAVIAN MOUNTAINS, 135 
spection of the formations that compose the fixed rocks in the 
north and south, good observations could easily be obtained ; for 
when going along the Alps from east to west, or crossways, 
frequent alternations of well-characterized boulders are met 
with, which cannot possibly be mistaken. I found that sort of 
white quartz which occurs in Bohemia among the boulder- 
stones, to the south of the Danube in Ensdalen, and even close 
to Altenmark, as well as abundantly around Linz, where a 
smaller kind of these boulders formed at least a tenth part of the 
paving-stones of the streets ; I did not see large boulders of this 
quartz. This was especially remarkable when I separated from 
M. Zahlbriichner at Ens, where he took the road to the east- 
ward and I to the westward. During my journey I had only 
district maps in separate sheets to make use of, which gave me 
the erroneous idea that Molk and St. Polten were situated to the 
south of Budweis in Bohemia, where I had found the quartz 
boulders mentioned in my former letter; I accordingly requested 
M. Zahlbriichner to see if these were found at Molk and St. 
Polten. I was therefore very much surprised to find them at 
Linz, until I observed by means of a more general map, how 
this place was actually situated with regard to Budweis, from 
whence it lies to the southward, some degrees westerly. 
They were not to be found some miles further westward ; but 
between Salzburg and Munich, and northerly of the last-named 
place, quartz boulders are again met with. In general, the masses 
of detritus and boulders at the northern foot of the Alps were 
composed principally of primitive formations, and in particular 
near the great alpine rivers, such as the Salza, Inn, and Iser, 
where limestone boulders predominate. 
Frankfurt on the Maine, 4th July, 1836, 
On my journey from Munich to this place vid Niiremberg, I 
have also seen very distinct alternations of different sorts of 
boulders, which to me appear so characteristic that no doubt 
can exist of their origin to one who is well acquainted with the 
formations of the German mountains. The great and frequently 
occurring alternations of soils of different origin are evidences of 
the same agency, and this is a fact which has been already long 
known. Between alluvium and diluvium a clear distinction 
ought however to be drawn. The plains at Munich and to the 
northward, for a distance of two miles (Swedish), are covered 
