THE SCANDINAVIAN MOUNTAINS. 107 
To make the difference in direction of the furrows plainer 
than it has been made by studying the foregoing description, 
they are drawn on the accompanying map (Plate I'V.): the prin- 
cipal furrows which have been hitherto observed will be found 
thereon, as well as their direction *. On observing this map 
it is seen that the difference in the direction of the furrows is, 
on a distance of only from six to ten (Swedish) miles, very 
considerable; that which at first most awakened my attention, 
was the great disparity found between the furrows at Fahlun 
and those south of Gefle. They run here 263° easterly ; but, 
on the contrary, at Gefle above 30° westerly (Third Part, A). 
When I first had these observations only, I began to suspect 
that some indication regarding their divergence from the direc- 
tion was to be found. My journey extended, however, only 
to Sdderfors, and the same way back. Afterwards, on another 
tour, 1 found in the road by Upsala that the furrows in the 
neighbourhood of Grisslehamn had, from the western direction 
at Gefle and Séderfors, again reverted to 7° easterly. This did 
not assist in explaining the cause, but, on the contrary, ap- 
peared to show that the furrows run without any regularity. 
Finally, I investigated the whole coast, from Gamle, Grissle- 
hamn to Gefle, and found the direction of the furrows at every 
place as they are now shown on the map. 
By this, as well as when I was enabled on the charts of the 
gulf of Bothnia to learn and know the rocks which, under the 
name of the Finngrund (Finn Shallow), lie beneath the surface 
of the sea, it was apparent that the furrows at Gefle and Ore- 
_ grund were side furrows, on each side of the Finngrund, by 
which the rocks on the coast assisted in a considerable degree 
to increase the deviation. 
_ Another and not less important difference in the direction is 
that which is found between the furrows on the eastern coast 
around Westervik, as well as on the western coast of Uddevalla. 
To explain the relation they bear, I have, on the basis of M. 
Hisinger’s researches, as well as my own7 on my journey, made 
do not include the magnetic variation, but these apparently do; thus— 
Stromstad ............ 19° 32’ + 45° 28’ = 65° Map, 63°. 
Christiania ............ 19° 50’ + 42° 10’ = 62° Map, 63°. 
* [The variation of the furrows to the east or west of south is shown on 
mye by the figures on the right or left hand at the head of the arrows.— 
uD 
+ Lhad not an hypsometrical instrument, only a level which turned once. 
