140 
same hours, under the superintendance of M. Encke, and 
the agreement is very remarkable. 
The second series of observations was made every five 
minutes during the twenty-four hours, commencing at noon 
(Gottingen time) on the 13th of November last. ‘These ob- 
servations were undertaken at the request of Baron Hum- 
boldt, and with the view of ascertaining whether there existed 
any connexion between these perturbations of the needle, and 
the meteoric displays, which have been supposed to recur at 
that period in unusual frequency. ‘The observations do not 
exhibit any very marked magnetic phenomenon; but on the 
following evening (November 14th) the needle was disturbed 
in a most unusual manner. It oscillated in very large arcs, 
and the maxima and minima of mean position succeeded one 
another with great rapidity. The whole range of the dis- 
turbance amounted to 1°. 20’. 
The nights of the 12th, 13th, and 14th of November 
were cloudy in Dublin, and no meteors were observed. 
Mr. Petrie gave an account of a very remarkable collec- 
tion of stone circles, cairns, &c. situate in the townland of 
Carrowmore, in the parish of Kilmacowen, and about two 
miles from the town of Sligo. They are of the class popu- 
larly called Druidical Temples, and have, in every instance, 
one or more Cromlech or Kistvaen within them. In some 
instances the circle consists of a single range of stones, 
in others of two concentric ranges, and in a few instances of 
three such ranges ; and nearly the whole are clustered toge- 
ther in an irregularly circular manner, around a great cairn, 
or conical heap of stones, which forms the centre of the 
group. The circles vary much in diameter, number, and 
height of stones, and other particulars ; and the Cromlechs 
also are of various sizes and forms. Many of these monu- 
ments are greatly dilapidated; but there are still existing 
vestiges of about sixty circles with Cromlechs, and as it is 
