70 Robert Chambers, Esq., on Changes of the 
it embraces in a beautiful curve, rising in a steep bank about 
240 feet above its waters. The outlet of the lake is through 
a deep trench in this formation. In the neighbourhood of 
the lake, the sandy plain rises towards the hills on each side, 
at a gentle inclination, and with a remarkably equable sur- 
face, like a sea-beach. What adds not a little to this resem- 
blance is a fringe of gravel at a greater inclination, abutting 
against the hill-side. Taking the height of the Midsen Lake 
on the day of observation at 420 feet above the sea, the ut- 
most elevation of this ancient sea-margin above the present 
sea-level appears to be about 656 feet. In the inner valley 
or trench, cut by the river, there are minor terraces, at re- 
spectively 522, 533, and 598 feet above the sea. A few miles 
down the valley, at the Trygstad post-station, a great ter- 
race is seen passing for several miles at one level along the 
hill-side, rendered the more conspicuous by the bright line of 
green formed by its grassy turf, in contrast with the dark 
hue of the woods which rise immediately from it to the 
very summits of the hills. With the spirit-level, I found 
the line of this terrace to be about the same height with 
Trygstad station, which is given as 590 Rhenish feet above 
the sea, in Professor Keilhau’s Goea Norvegica. As this is 
an unusually distinct example of the ancient beach, it is very 
desirable that its elevation were more exactly ascertained. 
Meanwhile, we may be tolerably satisfied, when we allow 
for the difference between Rhenish and English measure, that 
it is nearly, if not quite, identical in height with the terrace 
just spoken of as 598 feet. It may also be remarked, that 
the Scandinavian geologists report upon an ancient beach of 
597 feet at Lake Oyeren, a lower portion of this group of 
waters, distant only a few miles from Trygstad. It might 
be worth while to inquire if any connection can be established 
between these terraces. 
These ancient sea-markings will be the less liable to chal- 
lenge on the part of my present audience, when I remind 
them of the conclusion arrived at several years ago by the 
geologists of Scandinavia, that there are proofs, in terraces 
and shell-deposits, of that peninsula having been upraised 
from 600 to 700 feet, at a period immediately preceding the 
a 
