66 REPORT—1843. 
we have two of the vertices coinciding in time to those at 5 P.M., the undula- 
tions in one series being longer than in the other, there is consequently a 
displacement on each side of this central vertex, the first* vertex occurring 
earlier at Cadiz than at Gibraltar, and the second later. The undulation at 
Cadiz is shallower than that at Gibraltar ; the time it occupied was fourteen 
hours, and its depth ‘063, while at Gibraltar the time was nine hours, and 
depth 070, The next undulation is about the same length at both stations, 
the Gibraltar curve being two hours in advance of the Cadiz. 
“(B.) The coincidence of vertices appears to have been generally exhibited 
at the European stations; also in England, as noticed in the remarks on the 
London curve ; and not only did the Oxford curve exhibit a longer, but also 
a deeper undulation than the London curve. It may be remarked here that 
Oxford and London are similarly situated relatively to each other as Cadiz 
and Gibraltar. 
«(B.) Geneva and Turin are the remaining European stations that exhibit 
a coincidence of vertices; Geneva, similarly situated with respect to Turin as 
Oxford to London, London to Brussels, and Cadiz to Gibraltar, generally ex- 
hibits a greater range than Turin. The Turin curve, after the coincidence 
of vertices, is one hour in advance of the Geneva curve. 
‘«<(B.) The Hanover curve appears to form part of a distinct system ; it is 
to be regretted that we do not possess observations to compare with it. 
“(B,) From the above remarks, it appears that the affections of the atmo- 
sphere were very different in the British Isles and Europe. Those in the 
former gave rise to very extensive barometric undulations, while the obser- 
vations obtained from the latter group showed that the atmosphere was but 
slightly disturbed. 
“(B.) The occurrence of the small undulations first observed at Limerick 
and Markree, and traced with only one exception throughout the two groups, 
is avery interesting feature in these curves, as well as the descent of the baro- 
meter immediately following them, and which took place at every station in 
the British Isles and Europe. The small undulations appeared to be very 
irregular, and on two occasions, when they were scarcely observed, the states 
of the barometric column were decidedly different, namely, falling at Lime- 
rick and rising at London. The time, however, of the duration of these 
undulations varies upon the whole but slightly, Halifax exhibiting the longest 
and Oxford the shortest period, being respectively ten and four hours at 
these stations. 
* “ There appears to be some discrepancy between the statement that ‘ the next undula- 
tion is about the same length at both stations’ and the table. By consulting the curves it 
will be seen that the fall at Gibraltar from 8 P.M. to 5 a.m. consists of two undulations, al- 
though they are not so bold as those at Cadiz ; assuming therefore that the fall agrees with 
the Cadiz fall from 10 to 4, we have 
he + 
10 p.m. Cadiz. 10 a.m. 
"062 8 A.M. ‘o14 
8 P.M. Gibraltar. 8 A.M. 
0-538 Baw 012 
After these times, 10 a.m. and 8 A.M., the barometer fell at both stations, with the exception 
of the rise of 008 at Gibraltar at 1 p.m.; this will make the fall at Gibraltar from 8 a.m.’ 
equal 076,” 

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