[ I« j 



of yieldinsf dephlogifticated air> as Dr, 

 Priettiey discovered. Plants have a 

 power to correct bad air, and to im- 

 prove good air. Winds will blow 

 away the noxious particles of the 

 air 3 and bring on air corrected by the 

 waters of the feas, lakes, rivers, 

 and forefts. All thefe caufes exift 

 equally in the winter as in the iiim- 

 mer, or at leaft nearly fo. The in- 

 fluence of the vegetable creation 

 alone ceafes in the winter : but the 

 lofs of this influence is, perhaps, more 

 than amply counterbalanced by the 

 diminution of the general promoting 

 caufe of corruption, viz. heat. Every 

 bod v knows, that warm weather 

 h aliens in a great degree putrefac- 

 tion. In the iummer time number- 

 leis infedts are produced, which did 

 nor exift in the winter: thefe infects 

 infect the air by the corruption of 



their 



