128 SEFSTROM ON THE FURROWS WHICH TRAVERSE 
to lead to any conclusion, we can in no way so easily attain the 
object, as when we know of what minerals the soil is composed 
at a given place. In this respect we need not be doubtful re- 
garding the fruitful plain which lies on the lee-side of Hunne- 
berg, or on Westgotha-Fahlbygd, and we may nearly everywhere 
come to the same decision if we closely investigate the relative 
circumstances, unless the case be such as in Uppland and Rosla- 
gen, where the soil has come from the sea-shore. The tract around 
Elfkarleby is by far the greater part a delta of the Dalelfven. 
3rd. For navigation also, a knowledge of the resisting and the 
lec-sides of the coast, as well as the points and islands, may be 
serviceable; for on the resisting side the rocks are generally 
cleared from sand and gravel, and are very smooth, and have 
only isolated beds; while the lee-side, on the contrary, has sharp 
peaks, pointed sunken rocks, and reefs of gravel and sand. The 
right-hand and left-hand sides have generally the deepest chan- 
nels ; and, on the contrary, the resisting sides and lee-sides are 
the shallowest. If the question be as to the digging of a canal, 
we shall not so soon meet the rock on the lee-side. 
APPENDIX TO THE FOREGOING ESSAY. 
Later observations, made partly in Sweden, partly im other 
countries, communicated in letters to the Royal Academy of 
Sciences; by N. G. SErsTROM. 
Vienna, June 8, 1836. 
On a journey, during which my route was in a southerly direc- 
tion towards Vienna, I have been enabled to make some further 
observations on the boulder-stones and their course, which I wish 
to communicate as an appendix to my essay on the Furrows on 
the Swedish mountains. 
On the mountain plateau which lies to the south of Jénk6- 
ping, and which, about 1000 feet high, extends itself on the 
eastern and western coasts of Sweden, I now took another road 
which crossed the one I had previously taken, from Carlskrona 
to Jénképing, by way of Eksjé to Christianstad. On this pla- 
teau I made several observations on the furrows, which corre- 
spond with what I have mentioned in my former essay ; but 
as soon as I came down from the plateau, westward of Wexié, 
