MR MILNE ON A REMARKABLE OSCILLATION OF THE SEA. 



629 



and night was moderate, but that it blew steadily from the east. Previously, the 

 atmosphere and ground had been much parched by cold NE. winds. 



Mackerston. The following extracts were furnished to me by our President, 

 Sir THOMAS BRISBANE, from the very accurate Meteorological Register, kept there 

 by Mr BROWN, his principal assistant. 



Here, it will be particularly observed, that the wind, previously prevailing, 

 was from the N.E. ; and, even during the passage of the storm, it appears to have 

 retained this direction on the earth's surface. The upper regions of the atmos- 

 phere indicated, however, a different set of currents, which commenced with 

 SSE., and ended with W. 



It so happened, that on this day, Sir THOMAS was endeavouring to deduce the 

 height of his observatory, above the sea at Berwick pier, by barometrical admea- 

 surement. He had for that purpose a very correct barometer placed at Berwick 

 pier, the indications of which were frequently observed. Sir THOMAS has handed 

 to me a note of these, from which it appears that the greatest depression of the 

 mercury was reached about 7 h 40' P.M., in which respect it agrees with the baro- 

 meter at Mackerston Observatory. The following were the heights at Berwick 

 pier, and they shew the almost constant variation of pressure taking place in the 

 atmosphere. 1 



1 Sir THOMAS BRISBANE informs me that his attempts on the 5th July to deduce the height of 

 Mackerston above the sea, were completely frustrated, the three excellent barometers which he employed, 



VOL. XV. PART IV. 8 G 



