THE SCANDINAVIAN MOUNTAINS. 85 
on the slopes L and M on the southern part of the great rock, 
is contrary in respect to the normal furrows, so that it appears 
less easy to be explained. On the slopes L and M it may be 
perceived that the motion has been of the same nature as that 
caused by the water in a river when it makes an eddy behind 
some projecting point; such may also be seen at many dif- 
ferent places, as, for example, near Skyttgrufvan (the shooting 
mine) ; but at this place, of which we now speak, it does not 
give a satisfactory result, and cannot hold good with the points 
a and 6. In order to investigate this further, I caused the 
western side to be cleared of the rubbish with which it was for 
the greater part covered. The phenomenon then presented 
itself still more evidently, as well as showed that this d-viation 
is more to be regarded as the rushing forward of a stream from 
the slope on the western side of the hill; for when I measured 
a horizontal line from the plain on this side, in the level of the 
point %, it did not run to the south, but towards the south- 
east, and about in the direction of the line FG; it is thus pro- 
bable that the height of the neighbouring land has been the 
cause of this; it is not also improbable that even another cir- 
cumstance might have contributed thereto, as all the circum- 
stances show plainly that the boulder-stream had a considerable 
rapidity, as shall be shown hereafter ; and if so, probably behind 
a rock such as this a kind of suction had originated, of the 
same nature as that which Venturi and others have observed in 
hydraulics, and the result of this must have been the same as 
it now appears on the southern end of this rock. 
It may be seen here also that the furrows on the eastern 
side, for example, which is very steep, run in the same manner 
as has been before remarked, not directly up and down, but 
nearly horizontal, according to its given direction. 
Such rocks as these are to be found in many places; but 
near Askersund, one-eighth of a Swedish mile to the southward, 
to the left of the road leading to Stjernsund, there is one to be 
seen which is uncommonly beautiful, and from this cause, that 
on its southern side is a mass of rock situated between two 
large loose horizontal pieces of the same, projecting a little 
beyond its original bed ; but the power has not been sufficient 
to form a perfect separation and convey it to a greater distance: 
it sits on the wall, as the miners express themselves, and has 
wedged itself fast, so that it could not be separated without the 
application of a greater force. The same rule which holds good 
