120 SEFSTROM ON THE FURROWS WHICH TRAVERSE 
Baron Berzelius’s view thus appears to possess as much cer- 
tainty as any explanation of causes so remote can be capable of ; 
and for the same reason probably we must also assign to the 
boulder-flood a considerable force. 
In the provinces of Orebro and Calmar, East Géthland, and 
Smaland, we find traces of something similar. From four to 
five miles (Swedish) from Orebro, south of Wredstorp, and the 
inn at Svennevad, we meet with a gravel of limestone and alum- 
slate, just in the direction of the boulder-flood from the former 
situation of these minerals; and high up on the hills south-east 
from Joénképing, the sandstone of Kast Gothland is to be met 
with. 
It is besides very commonly to be seen that the boulders are 
conveyed upwards over the mountain slopes, which have from 
33° to 40° inclination, to effect which not a little force must 
certainly have been required. 
§ 10. 
The depth of the Boulder-flood. 
This question cannot be answered before it is first decided 
whether the ridges of land have since been considerably elevated. 
If this has not taken place, we now know that the furrows are 
found twenty-one feet below the surface of the sea (at Carls- 
krona), as well as somewhat more than 1500 feet above it 
(near Sarna in Dalecarlia). In the mean time, we might con- 
clude that such mountains as Hégkarnsklak, Pilboberg, Taberg, 
Omberg, Billingen, and Kinnekulle, have retained their relative 
heights above the surrounding land, such as they were when 
the boulder-flood passed over them; and under these circum- 
stances it has produced its effects at a depth of at least eight 
hundred feet, and has to a great height carried with it boulders 
which have furrowed the mountains. 
§ 11. 
On the general direction of the furrows in the South of Sweden. 
On this point also it is now too early to form a decided judge- 
ment; but some reflections may be made, and ought not to be 
neglected, as they afford an opportunity of making closer inves- 
tigations, particularly such as are caused by adverse opinions ; 
