130 Occasional Meteorological Remarks and Observations, 



through Sirius. At 10 h 11/ well-defined, but narrow, through 

 Lepus, and the lower part of Canis Major; at 10 h 16' faint, 

 but still visible, through d Canis Major, and part of Erida- 

 nus. Its course was almost S. W., diametrically opposite to the 

 wind, which was tolerably strong. The moon was extremely 

 bright, being fifteen days old, and southing at 10 h 23' ; and 

 therefore diminished extremely the brightness of the arch, 

 which passed over her disc at 9 h 49', at the time that it. passed 

 through Procyon. Notwithstanding this bright moonlight I 

 could perceive through the auroral arch the two minute stars 

 of the sixth and seventh magnitudes which form v Cassiopeia?, 

 with my naked eye, which proves the extreme tenuity of the 

 arch, unlike others of a similar kind which have been observ- 

 ed which sometimes obscure all below the second magnitude, 

 as I think was the case with that of March J 825. These ob- 

 servations will render it easy to trace the course of the arch 

 over the heavens, and its direction and velocity. 



January 31st. — The barometer at Edinburgh was at its 

 minimum, 29.06. Its mean height for the month was 29.794. 



February 25th. — Heavy hail showers. This month was 

 generally dull; and- no severe frost occurred. The prevailing 

 wind W. and S. W. 



March 10th. — This extraordinary day had the common 

 temperature of summer, as the following observations prove : 

 8* m., 561°; 121, 68°; 1* 10' a., 68.6; l h 30' 69J°; l h 45' 70f ; 

 8| a. 59£. The wind was excessively changeable through 

 the day, scarcely ever blowing the same a few yards distance. 

 Barometer 8£ m. 30.04; 1* 10' a. 30.07; 8J a. 30.02, at 

 which ^t remained during the next day. The wind settled in 

 the east and brought cold weather, as on the 11th we had 8| m. 

 48J° ; 4 a. 53° ; at midnight 44£°. The wind varied from N. 

 to S. by the E. points. Next day, 



March 12th. — The barometer rose to a very considerable 

 height at Edinburgh. By observation both at 8| a. and J 0J a. 

 it was 30.40 ; and next morning, the 13th, at 8 \ m. by a very 

 careful admeasurement, it was 30.409- 



March 28th. — At midnight the sky, which had been very 

 cloudy, cleared from the north with amazing rapidity, and be- 

 came perfectly bright. It would be curious to know at what 

 time this sudden breaking up was observed in different places. 



