222 
The Rey. Samuel Haughton communicated a short account 
of an Aurora, visible in Dublin on the night of October 2, 
1851. This Aurora passed the zenith; its crown, and the point 
of the horizon at which the streamers were vertical, being si- 
tuated in the magnetic meridian. The transverse ares were 
sensibly portions: of great circles to a distance of about 45° 
from the horizon, and intersected the magnetic meridian at 
right angles. In the neighbourhood of the crown of the Au- 
rora the transverse arcs were not great circles, and presented 
opposite curvatures at the different sides of the crown. At 
8.30, p.m. the streamers to the west of magnetic north were 
red, the streamers to the east being colourless, or perhaps 
slightly yellowish. At 9, p.m. the bearing of the north pole- 
- star was taken witha Kater’s compass and another. The read- 
ings were 30° W. and 31°W.; assuming the mean of these, 
and subtracting the variation in Dublin, 26° 30’, this obser- 
vation would appear to indicate a westerly deflection of 4° 
produced by the Aurora. ‘The air at the time of observation 
was saturated with moisture ; barom. 29°15 in. ; dry bulb therm. 
49°; wet bulb therm. 49°. The streamers seemed to intersect 
the transverse arcs at right angles, and to follow the deviations 
of the latter from great circles in the neighbourhood of the 
crown of the Aurora. The distance of the latter from zenith 
was not measured, but it appeared about the same as the dis- 
tance of the north point of the Aurora from the meridian. 
The Rev. Charles Graves, D. D., communicated a notice, 
extracted by Mr. Charles P. Mac Donnell from the Cata- 
logue of MSS. in the Library of Cambray : 
*« Catalogue descriptif et raisonné des manuscrits de la 
Bibliothéque de Cambrai, par A. le Glay. Cambrai, in 8°. 
1831. pp. 122. 
*¢ MS. 619. Canones Hibernici, in fol. vel. b. C. M. MS. 
a 2 colonnes, écriture minuscule du 8 Siecle. A la fin du 
