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 I4th) 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 cairns 

 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 



