522 Dr. Moll on the Aurora Borealis. 



OBSERVATORY, UTRECHT. 



Hour. Barom. Therm. Weather. Wind*. 



H. M. Inch. 



1831, Jan. 5. 2 33 . 29.807 . 31.3 . Foggy. . Calm. 



6. 6 8 . 30.083 . 32.6 . Thawy. . N.N.E. 



7. 1 34 . 30.500 . 29.3 . Very clear. N. afterwards S.E. 



8. 2 48 . 30.400- . 29.9 Hail and Snow. S.S.W. 



9. 2 42 . 29.963 . 36.8 . Cloudy. W.S.W 



On the 3d of March, 1821, when a shock of earthquake 

 was felt at Dover and the neighbouring places, nothing in the 

 atmospheric state indicated in this country that anything ex- 

 traordinary was happening at so short a distance. At about 

 4 P.M. the barometer stood at 29 520', the thermometer 

 at 47 3'. The air was dark and overcast ; it blew a strong 

 gale from the W.S.W. 



OBSERVATIONS ON THE AURORA BOREALIS OF THE 



7th OF JANUARY, THE llth OF JANUARY, AND 



THE 7th OF MARCH, 1831. 



BY THE HON. CHARLES HARRIS. 



FN consequence of the account of the Aurora Borealis of the 

 7th of January, given by Mr. Christie in the last Number 

 of this Journal, we have been favoured, by the Hon. Mr. 

 Harris, with the following extracts from his Meteorological 

 Journal, kept at Heron Court. 



Friday, January 1th, 1831. Magnificent Aurora Borealis 

 at night. It first appeared about 5 h 30 m P.M., in the shape of 

 a white cloud in the north, 10 in depth and 55 high, extend- 

 ing from west to east, much denser towards its extremities, 

 where it was edged off with prismatic tints of red and green. 

 It seemed coming over from N., and a narrow band of it passed 

 over as far as about 20 on the south of the zenith. In the 

 north it soon became traversed with bright columns, with here 

 and there a hazy patch of flame colour, especially in the N.W. 

 It was most beautiful about nine P.M., when the cloud came 

 nearly over head, being driven, as it were, by the wind from 

 the north. Its eastern extremity, which was very dense and 

 luminous, drove by as far as E.S.E. Suddenly, however, it 

 streamed back again, in bright streaks, towards due north, look- 



