C 94 1 

 if the falubrity of the air was th£ 

 chief object of fuch a plantation. 

 I made ibme experiments for this 

 purpofe, of which a few are placed 

 in the fecond part of this book. But 

 I am far from thinking myfelf in- 

 titled to decide any thing upon this 

 head ; the more, becaufe all trees 

 co-operate to the fame end, and 

 becaufe the ceeonomical advantage 

 ariilng from the preference of one 

 fort of tree above another may be 

 thought to over-balance the fmall 

 advantage to be derived from its fu- 

 periority in rendering the air purer* 

 I muff, content myfelf with the dif- 

 covery of the fa<£t, and leave the 

 reft to others, who, by farther and 

 more decifive experiments, may have 

 a better right to decide fomething 

 upon this head than I can as yet 

 pretend to. 



SEC- 



