1925.) 
ate ler are pene it the Bib. Univ., 
wal, Bt iS a 
‘The S AMicrations of the Level of the Sea, as 
“ ad. “with the Land, which seem conti- 
‘igher by many feet, and then declining 
ain with 
Siicctle 
é eriods of time, have rather sur- 
isfied by the theoretic assurances of 
ving on, (see our 56th vol, p. 200), 
} similar slowness, so as to return 
singly Tek overlooked. by philosophers, 
abeken, geologists, that the waters have 
aters rising slowly and progressively, 
to. the same level after con- 
who in this instance appear to have been 
been u uniformly, but with extreme slowness, 
Cactine in height, ever since a period 
highest*mountains were covered 
ipaens ? Briencrona, with a view to- 
establishing data for future compa- 
Yon’ this interesting subject, was at 
great pains, in the year 1820, to'select thirty 
points on as’ many solid rocks, situated in 
different partsof the Baltic sea, and thereon 
deeply ‘to “engrave and’ designate lines 
marking the le level of that ‘sea. IM. Holt- 
wey we. 
strom’ conceives, however, and has stated in 
not taken previously to ascertain a mean 
height of the water, which these lines should 
bestowed much pains on this subject in 
Scotland, finds; that the arithmetic mean 
two consecutive tides, is in most places, a 
stationary point for being marked and 
_ to'future comparisons as to the rise or fall 
orese sea.” 
a nt at. Alford, in Aberdeenshire, 
N.). situated near to the south- 
of Aurora is common, and 
southward of which it only occasion- 
AP. 
us phenomenon, the subject of a long 
1 connected series of observations, his 
in. al ge > number of Jameson’s Edinburgh 
Phil. . ; the most novel and impor- 
nous pencils of rays, which occasion the 
Aurora, proceed yertically from the earth, 
compact, which is:comparatively: thin i its 
dimensions northward: and southward, but 
east to west, at right angles to the magnetic 
meridian. «This luminous stratum, when 
into a luminous arch: this appa- 
rent arch, and the stratum oceasioning it, 
tinually in apparent motion ; moving parallel 
to itself; sometimes to the southward, and 
this motion is very swift, and the arch pro- 
portionably bright; on one evening, an 
the Bull. Univ., that'the requisite care was 
haye indicated.’ Mr. Stevenson, who has 
between the highest and lowest states of 
} from time to time, with a view 
Or econs ora, Borealis, The Rey. J. -Farquhar- 
of the terrestrial. zone, wherein 
has made this hitherto mys- 
from. which are given at length 
tant of these ‘inferences are, that the lumi- 
or nearly so, in a stratum, more or less 
which stretches a great way in length from 
compact, is, by the principles of perspective, 
instead of being stationary, is almost con- 
at others reeeding- northward :. occasionally 
Mowrnty Mac. No. 404, 
Spirit of Philosophical Discovery. 
“apparent arch of Atirora, first noticed 45° N. 
529 
of: the zenith of “Alford, in “half an hour's 
time had reached 30° y S. of the zenith, 
and then became indistinct: at other times, 
and moré usually, the arch was faint, and 
had a very slow motion southward or ‘north- 
ward, so that the brightness and miotion 
are concluded to have a close connection. 
A brilliant arch of d4urora, which Was 
visible to a part of Scotland, and great part 
of England, ‘as far south as Croydon in 
Surrey, on the evening of the. 17th of Octo- 
ber 1819, was observed by Mr. Farey, in 
Borrowdale, i in Cumberland, to haye a. simi- 
lar motion southward and again northward, 
to those which are mentioned above. See 
the Phil. Mag. vol. 54, p. 828. "Our esteem- 
ed correspondent Mr. W. Pitt, of Cailisle, 
(see vol. 49, p. 10), was not alike favourably 
circumstanced, in a very deep’ valley, for 
noticing the southward’ and’ northward 
motion of this luminous arch.» ‘In aceord- 
ance with Mr: Hood’s arctic observations, 
mentioned ‘ia p. 77 of vol. 56;°Mr. Par- 
quharson considers the usual’ régiori ‘of the 
Aurora Borealis to’ he; above’ and iinme- 
diately contiguous’ to that, in which’ the 
clouds are forming, at the time of its appear- 
ance: on one oceasion’ last ‘year, he saw 
an Aurora’and a Cloud-come into Contact’; 
the latter, for a short period, became lumi 
nous in consequence, but the adjacent part 
of the Aurora vanished simultaneously. 
The meteorological and curious, amongst 
our readers, will, we trust, vigilantly direct 
their attention to such conspicuous Aurora 
as May appear, in orderto make and record 
observations on | the southward or north- 
ward motion of any luminous arch which 
may be formed. See Dr. -Thieneman’s 
opinion on cs phenomenon in p. 234 of 
this yol. 
Pretended Parallel Roads, or natural ter- 
races, surrounding, in level directions, the 
skirts of mountains, composed: of aliost 
vertical rocky strata, such as those of Glen 
Roy in Seotland, have lately been observed 
by Captain Basil Hall, in the: valley of 
Coquimbo, in Chili, in South’ America, and. 
are described, in his voyage: thither.. When 
the modern fancies which-ascribe these ap- 
pearances to beaches, at the margins of a 
succession of aucient lakes on the spots; 
shall have followed, as justly they deserve, 
the fate of the former whims, which  con- 
$idered them: as sportive roads of ancient 
giants. !—and when the. stratification‘of both 
kinds, the regular and the transverse (the 
latter by some called) stratula) of moun= 
tains, has ‘been more strictly attended’ to, 
without bias from preconceived theories, 
this phenomenon will (in a less obtrusive 
form than in Glen Roy) be found novery 
unéommon one: the upper parts of some of 
the» slaty hills near Snowdon, in North 
Wales, exhibit this double stratification, viz. 
almost vertical and horizontal at the’ ‘same 
time, an instance of which is shewn i in the 
3 ¥ Annals 
