1(54 ^ tTNITED a^TES. 



Remarks upon Mr* Vclney's theory^ and, ufion 

 the siififiosed change of Climate in the United 

 States* 



However conformable the principle of the influ- 

 ence of the south-v./est wind may be to fact, when 

 applied to the country watered by the river gt. Law- 

 rence ; it will not account for a contrary change in j 

 the climate of the river Mississippi, which, instead 

 of being milder, has actually become not only warmer 

 in Summer, but colder in Winter. Orange-trees, 

 (says Mr. Dunbar of Natchez),* and other tender 

 exotics, have suiTered much more in the neiglibour- 

 liood of New Orleans, within these four or five years, 

 than before that period: the sugar-cane also has been 

 so much injured by the frost of the two last Winters, 

 as greatly to discourage the planters. In former 

 years (Mr, D. continues) I have observed the mer- 

 cury of the thermometer not to fall lower than 26 or 

 27 degrees ; but, for a few years f)ast, it has general- 

 ly once or twice in the Vv'inter, fallen as low as from 

 17 to 20 degrees: and on the 12th December, 1800, 

 it sunk to 12 degrees, which has no parallel in this 

 climate, and indicates a degree of cold, which, in 

 any country, would be considered considerable, and, 

 probably, may never be again produced, by natural 

 means, in lat. 31 1-2 deg. 



* Trans, Arcev. I'*hiL Sec, vol. viil. 



