134 SEFSTROM ON THE FURROWS WHICH TRAVERSE 
Hunneberg, and the Saxon Switzerland. It. is even possible 
that these mountains may have been elevated since the forma- 
tion of the furrows; but if such be the case, it will be ascer- 
tained by an accurate investigation, determining the direction 
of the furrows, which, in respect to the heights, must have the 
usual deviation from the normal direction, that is, if the moun- 
tain lies unmoved from its original site. It is very remarkable 
that the granite alps in Southern Styria have exactly the 
same rounded form as our Swedish mountains, rounded on the 
northern, and precipitous on the southern side; but my time 
was not sufficient to allow me to investigate them further. Thus 
the principal or most remarkable precipitous mountains appear 
in most places to have been formed in this way; the loose rocks 
(Flusch) under the calcareous alps have been undermined, after 
which the overhanging harder rocks have fallen down. At other 
places, however, this is evidently not the cause. 
Munich, 29th June, 1836. 
Next to the elucidations for illustrating the petridelaunian 
phenomenon which are to be obtained from the observation of 
furrows in these districts, are undoubtedly the facts which are to 
be derived from investigations on the boulder-stones in different 
places, but which I have not been enabled to undertake. I 
have, however, seen thus much, that it is a complete error to 
suppose that boulder-stones do not occur in alpine districts, 
for they are found there in equally as large quantities as with us, 
nevertheless not of so large size, because the rocks which were 
rolled could be easier crushed; nor so conspicuous, because 
they are covered by a more luxuriant vegetation. With respect 
to the direction of the boulder-flood from north to south, or the 
reverse, Viz. as is supposed to be the case in Western Switzer- 
land and Jura, as regards the deviation of this flood to the east 
or west, the observations on the boulder-stones will give the 
most decisive results. To this point I have therefore directed 
my attention during my journey, but I am too little acquainted 
with the minerals which occur in the fixed rocks north and south, 
to say with certainty whence the boulders which I have seen on 
my way originated. ‘The necessary information is not to be ob- 
tained in such cases from geognostical works and maps, owing to 
the many uncertain, and by different authors, differently-named 
minerals, of which they are constructed. From personal in- 
