SEES 29105817

KN ADDITTON,

To be inſerted near the end of the Additional Note XKÜI11, P- 433» 9 he Arft volume, immediately before the laſt Jentence.

The following circumſtance, which I obſerved this week, is ſufficiently curious to be here inſerted.

On the fifth of April 1799 tbe wind, which had blown for ſeveral days from the N- E. and a great part of that time was very violent, became due E. The barometer ſunk nearly an inch, clouds were produced, and much ſnow fell during the whole day; and on the next day the wind became again N. E. and the barometer roſe again. The ſame circumſtances exactly recurred on the eighth of April; the wind again changed from N. E. to due E. ihe barometer ſunk, and ſnow and afterwards rain were the conſequence.

Which is thus to be explained. On April the fiith the atmoſphere became lighter, I ſuppoſe, becauſe no more air was ſupplied from the ardtic circle, and the[noW was produced from(ame of the ſouthern air over this country falling down, 1 ſuppoſe, on rhe lowered current of nor- Men am. BuCwby- didehe N. E. wind on both theſe days change to duc E.? To this is may be anſwered, that as n0 new air Was DOW brought from the N. and in conſequence the barometer funk; and as air from the 9. evidently became mixed with that from the N. whence the clouds and conſequent(10w; the further progrels of he N. E. air towards the 9. was ſtopped by the oppoling

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