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SECTION II. 



Experiments^ Jbewing the difference 

 in the purity of the dephlogiflicated 

 air, which the leaves of the fame 

 plant give at different times. 



15. Leaves of an apple-tree in^ a *J 

 an inverted jar full of water were^^ 

 expofed to the fun-fhine from ten troyed * 

 in the morning till five in the af- 

 ternoon; the teft of the air was, 

 1.80; 1.58; 1.39; 1.86; 2.79. 421 



16. Leaves of the fame tree ex- 

 pofed during the fame time in the 

 fun-fhine in a green bottle, 1.82; 

 1.62; 1. 71; 2.64; 3.64. 336 



17. The fame leaves, which 

 were employed the day before in ex- 

 periment 15, were expofed again 

 with frefh pump-water in the fun- 



O mine : 



