THE SCANDINAVIAN MOUNTAINS. 83 
we distinguish the stones that are rolled, from the Karth-stones 
(Jordsten, Geschiebe, Blocs erratiques), by which we under- 
stand the large loose stones deposited immediately under the 
surface of the earth, seldom or never rolled blocks of stone, 
which appear to have been conveyed to their present situations 
by an agency quite different. 
Should it be wished to give the boulder-flood a scientific name 
derived from the Greek, and suitable to every language, it may 
be called the Petridelaunian-flood, from 7rerp/d.oy, a little stone ; 
and éravye, I roll forward. 
byl: 
On the direction of the boulderstone-furrows. 
From the investigations I have had an opportunity of making 
on many places over the Swedish mountains, it has appeared that 
the northern sides of the hills and mountains are all rounded and 
destitute of peaks and angles, whilst, on the contrary, on the 
southern ends sharp peaks and corners still remain, evidently 
of a very altered broken surface, a consequence of the geological 
occurrences which rent asunder and uplifted the mountains ; and 
the furrows run directly over the mountains between these 
oppositely-shaped formations, as if the steep northern part of 
the mountain had offered the flood a resistance, by which it 
had been smoothed down; on the contrary, on the southern 
end, the mass has continued its course without, in its fall, break- 
ing off and furrowing this inclining surface of the rock, from 
which it was protected by the force of the raging flood. 
To give an idea of my first investigations for an explanation 
of this phenomenon, I have annexed a sketch of a rock adjoin- 
ing the mines of Fahlun to the westward, both with a Surface- 
plan, and Section (Plate III.). The lower end 4:0 of the sec- 
tion, fig. 1, lies close to the surface of the earth. These heights 
are seen by the same figure, observing that the distance be- 
tween each of the horizontal lines on the section 3°5, 3:0, 2°5, 
is half a Swedish foot. The end K lies towards the north, 
and the end I towards the south, from which is shown what is 
before mentioned, namely, that on the northern side the edges 
are worn away, whilst those on the southern side remain. 
The same appears on fig. 2, which shows the same rock on 
aground plan. The point near the top marked 6 1s a station 
made for laying down the maps of the mine. The oval-formed 
lines around that poivt show the places on the surface of the 
rock which lie 0°5, 1-0, 1°5, 2 feet, &c. under & , and correspond 
G2 
