E *S8 ] 



POSTSCRIPT, 



AS I went on with my expe- 

 riments during the whole time this 

 hook was printing, I continued to 

 difcover more and more the fecret 

 operations of nature in regard to 

 cleanfing our atmofphere. I have 

 carefully regiflered in my notes the 

 refult of the experiments, which I 

 may poilibly communicate to the 

 publick in a fecond volume, toge- 

 ther with fome more deductions 

 which I may draw from my remarks. 



Though I am obliged abruptly to 

 flop my further refearches, I cannot 

 difmifs the reader without acquaint- 

 ing him, that, as foon as the warm 

 weather began to ceafe, and the 

 autumnal colds to fet in (the ther- 

 mometer of Fahrenheit being un- 

 7 L der 



