[ J 49 3 



PART the SECOND. 



Containing a feries of experiments 

 made with leaves, flowers, fruits, 

 fralks,and roots of different plants, 

 on purpofe to examine the na- 

 ture of the air they yield of 

 themfelves, and to trace their 

 effedts upon common air in dif- 

 ferent eircumflances. 



SECTION I. 



Introduction. 



EFORE I proceed to give an 

 account of the various experi- 

 ments I made during the courfe of 

 L 3 this 



