ON ATMOSPHERIC WAVES. 36? 
itself felt either at Gene^'a or St. Petersburgli. It was distinctly apparent at 
Christiania and Paris. 
The numbers in this table and Table IX. are not comparable on account 
of their relation to different waves. Table IX. exhibits the barometric fall 
resulting from a north*westerly wave, near the epoch of the crest of the 
great symmetrical wave; and Table XII. a fall resulting from a south-westerly 
and north-westerly wave, just previous to the setting-in of the great wave; 
they however strikingly agree in the general fact of a diminution of range 
from the north-west. 
Table XII. 
Harometric fall resulting from the troughs that crossed in the centre and 
south-east of England on Nov. llth, 1842. 
Station. 
Fall. 
Station. 
Fall. 
Belfast . 
Eog. in. 
1-49 
1-39 
1-36 
1-36 
M7 
1*16 
Plymmith 
Eng. in. 
1-12 
■b5 
•52 
•SO 
*02 
Cork. 
ChrisHanifl . . 
Shields .. 
Pnri? 
Orkneys. 
Bristol .... 
St. Petersburgh.. .. 
Geneva 
London . 
Results. 
In collecting the results of this examination, the following points of simi¬ 
larity, with the results of pn^vious investigations, are strikingly exhibited. 
I’ii'st. The return oi the great symmetrical wave. This, as we before no¬ 
ticed, occurred in the south-eastern angle of our island under very peculiar and 
remarkable circumstances, the barometer beingahovc tliirty inches during the 
entire period of its development. The. area of greatest symmetry is closely in 
accordance with tlie results of our fornmr discussions; this circumstance goes 
far to confirm the result deduced from the c-xamination of Sir John Her- 
schelV hourly observations, “ that Brussels is entitled to bo regarded as a 
point of comparatively gontlu barometric disturbance, * * » and may be re¬ 
garded as, ill a certain stmso, a nodal point, where Irregularities arc smoothed 
down, and oscillatory movement in general is more or less cheeked; and 
such movements increase in amount aa we recede from Brussels as a centre, 
especially tow.ar<ls the north-west as far as Markree." Ramsgate, the nearest 
station to Brusw'U, presents ns with the curve of greatest symmetry. It is 
however not only the general symmetry of the curve that constitutes this 
point ol similarity, wc have the essential features exhibited in the Jive sub¬ 
ordinate waves which pcculiai ty characterize llie great syinmotrical wave of 
November. As we proceed from the south-caj»t towards the north-west, we 
have the symraelr)' cunsiderably departed from by the greater development 
of the first subordinate wave on the posterior sdope: this forms a most re¬ 
markable contrast lo the symmetrical wave nf November 1845, which at 
this part presented a eousidemble depression. It ia not a little curious, 
and goes far to show that we arc approaching tiie true explanation of the 
ntxlal character nf Brussels, to observe that movements so dissimilar in 
their character, so oppwito in their value, and preseutiog themselves under 
.such a diver.-siiy of aspects, should, itt a certain locality and on pnrticular 
lines of country, manifest by means of the barometer, constant and well- 
