84 SEFSTROM ON THE FURROWS WHICH TRAVERSE 
with the same lines on the section, which is taken in the line 
1 K, and gives a correct idea of the form of the rock. From 
this figure it is rendered still more evident that all the angles 
on the northern, or, properly, the north-western side, are worn 
away, whilst on the south-eastern side the pointed ends re- 
main. There are also no furrows to be found, except on the 
upper surface of the rock L and M, which lies even with the 
rock from 2 to 2°5 feet under ¢. 
The arrows on fig. 2 denote the direction of the furrows, 
which, besides, is marked with lines, as well as described on the 
map, as it has been read off immediately from the compass when 
the line of degrees which denotes 360°, or 0°, and 180° have 
been laid parallel with the furrows*. By this it may be seen, that 
already, on such a small rock as this, not thirty feet long, the 
furrows diverge considerably from each other in their direction. 
The furrows, which commence at K and end at I, go over 
the highest ridge of the rock, and all follow the same direction, 
as if they had been drawn with a line, and could thus be con- 
sidered as normal. On standing opposite, on the northern side 
of the rock, or from whence the boulder-flood came, and turning 
towards the south, it will be found that the furrows on the 
western side diverge towards the right, whilst those on the 
eastern side diverge towards the left. That this difference is 
not accidental is very evident, for when the rising part of the 
rock made an impenetrable barrier against the rushing stream, 
this last-mentioned force must have diverged on both sides, 
and it would be in truth more inconceivable had the furrows 
not deviated as they now do. All this is very natural, as well 
as an evident sign that the boulder-stream has passed from 
the north to the south, and could not possibly have gone in the 
opposite direction. This deviation, however, on both sides, 
concerns principally the furrows which are on the northern end 
of the rock, on each side of the normal furrows; whilst, on the 
contrary, when lateral furrows come up on the sides of the 
point §, they approach towards the normal direction, and this 
of itself is very natural, as the consequence of the boulder- 
stream having gone from the north to the south. 
The deviation which the furrows make at a and 6, as well as 
* The degrees on the compass are numbered from north, east, and around to 
the north. 90° stands thus to the east, 180° south, 270° west, and 360°, or 0° 
north. This method of numbering is for the better avoiding any uncertainty, 
otherwise one might easilv mistake the east for the west when the needle points 
to the east, and the furrows lie to the west of the north line. 
