72 REPORT—1843. 
Abnormal protuberances.—At Gibraltar, as already noticed in the terms of 
1836, a low and unequivocal rise and fall from 14 to 18 hours, where, accord- 
ing to the law of periodicity, the reverse ought to have happened. A relative 
protuberance, similar, no doubt, in character, occurs at Cadiz in the interval 
from 13 to 16 hours, though (owing to the generally descending course of the 
curve from the 11th to the 16th hour) it rather appears as an abrupt shoulder 
than as a positive elevation. 
St. Jean de Maurienne and Geneva, both offering a good deal of irregula- 
rity, yet preserve a good parallelism, notwithstanding the intervening Alps, 
high among which the former is situated. 
June 1837.—Markree, Halifax, Oxford, London, Greenwich, Ashurst, 
Brussels, Hanover, Drachenfels, Kremsmiinster, Geneva, Turin, Cadiz, Gibral- 
tar, Tangier. 
Diurnal oscillations—Nowhere well made out. At Cadiz and Gibraltar 
the place of the 16 minimum is occupied by an abnormal maximum of the 
character already so often noticed. 
Term fluctuations—At Markree, Halifax, London, Oxford, Brussels, a 
regular and (with exception of Markree, where the curve is considerably 
convex on and near 12 hours) a nearly uniform rise, at nearly the same rate 
in all, of about 0:01 inch per hour. 
Beyond Brussels, in this order of sequence, the character changes. At 
Drachenfels the rise was trifling till the 9th hour, when a sudden jump up- 
wards of 0:086 took place, which (as Mr. Forbes’s barometer was of course 
a portable one) might be owing to some accident ; especially as the subsequent 
course of the curve is level, or nearly so, as far as 16 hours, when it begins 
to rise in correspondence with the Brussels curve. 
Hanover and Kremsmiinster fall rather than rise, though but very slightly, 
during the first 4 or 5 hours. Both thence rise slowly till ]5 hours, then 
pretty suddenly. In the Hanover curve the rise continues to theend. And 
at Kremsmiinster it extends only to 20 hours, where a flat maximum is at- 
tained, followed by a slight but continued depression to the end of the 
series. 
Geneva and Turin hold a kind of reversed parallel; the former, after some 
undulation, rising to a maximum at 12 hours, and thence falling to 14 hours; 
the latter falling to a minimum at 6 hours, and thence rising until 4 hours. 
After these epochs respectively both curves run nearly level to the end. 
Cadiz fluctuates much and irregularly, Gibraltar little, and Tangier main- 
tains throughout an almost unbroken level. Neither of the three offer any 
features of resemblance to the other curves already described. 
Little more can be gathered from this term than that a general rise of the 
barometer took place during its continuance in the north of Europe, which 
was only partially participated in, in its middle, and hardly at all in its 
southern regions. 
Dec. 1837.—Markree, Edinburgh, Halifax, Cambridge, Oxford, Ashurst, 
London, Greenwich, Brussels, Hanover, Kremsmiinster, Geneva, Turin, 
Cadiz. ' 
The principal feature of this term is a complete separation of Turin from 
all the stations north of the chain of Alps as well as from Cadiz, both in respect 
of the amount and character of its barometric fluctuations. In the curve for 
this station a gentle rise throughout the series of about 0°13 inch, witha flat- 
tened minimum in the earlier hours, a somewhat undulating and gentle rise 
to a relative, or in some cases to an absolute maximum, during the greater 
part of the projected 24 hours; a slight tendency to depression in the morn- 
ing and forenoon of the Zad day of the term, and a resumption of the gentle 

