VOL. LXV.] 



PHILOSOPHICAL TRANSACTIONS. 



(jig 



came likewise after rain, and was succeeded by a frost of 4-^ days, wind shifting 

 between n. w. and s. e. The last snow in January, on the 24th, fell with a 

 s. w. wind, which set in the day before. It was followed by a moderate frost of 

 one day, though the wind continued in the s. w. The snow on the 1st of 

 February came with a s. w. during a sharp frost. The wind was in the n. e. 

 before the snow, and returned to the same point the next morning; the frost 

 sharper than before the snow. The snows in the latter part of November were 

 generally accompanied with rain, and did not bring actual frost. The snow on 

 the Qth of December came after 2 days frost, which it seems to have put an end 

 to. For though it froze in the evening after the snow, the frost was much less 

 severe than the preceding night, and a thaw came with rain, wind n. e. the 

 next day. 



There were only 2 thunder storms this year, viz. August 27, 2 p. m. baro- 

 meter 29.64 inches, thermometer 63°, wind n. w. September 24, 9 p. m. ba- 

 rometer 29.42 inches, tliermometer at 2 p. m. 64°. 



It is an old observation, that a n. e. wind in this country generally makes the 

 barometer rise. This naturally leads to an inquiry, whether there be any general 

 connection of the rise and fall of the barometer with the setting of the wind. 

 On comparing the general account of the barometer for the year 1774, as stated 

 at the end of the meteorological journal, with the journal at large, I found that, 

 in 7 months out of the 1 2, the greatest height of the barometer was accompa- 

 nied with a north-easterly wind; and in 8 months out of the 12, the least height 

 of the barometer was accompanied with a s. w. This incited me to take the 

 trouble of making out the preceding table, which shows the mean height of the 

 barometer which accompanied each wind in every month, and for the whole year. 

 And it appears, that though the barometer may be almost at any height with any 



4K2 



