lxvi CONTENTS. 



Part the Second, Containing a feries of ex- 

 periments made with leaves, flowers, fruits, 

 Jiaiks, and roots of different plants, on pur* 

 poje to examine the nature of the air they yield 

 of themfelves, and to trace their effects upon 

 common air in different circumjlances, p. 149 



Se&. I. Introduction, ibid. 



II Experiments fhewing in general the degree of 

 goodnefs or purity of the dephhgiji';cated air ? 

 which the leaves of plants yield in the fun~ 

 jhine, j S5 



II. Experiments, fhewing the difference in the 

 purity of the dephlogijiieated air. which the 

 leaves cf the fame plant give at dffertnt 

 times, J 93 



III. Experiments tending to inveftigate at what 

 time of the day plants yield the bejl dephh- 

 gifiicated air, 196 



IV. Experiments tending to invefiigate what 

 quantity of dephlogijiieated air a certain 

 number of leaves yield, 200 



V. Experiments tending to invefiigate the 

 quality of air yielded by plants in the night, 

 and by aay in dark or Ji haded places, 303 



VI. Experiments tending to invtjligate to what 

 degree plants may affeel common air in the 

 night, and by day time in Jhaded places ^ 207 



VII. Experiments fhewing that the damage done 

 to common air by the night is very inconftdera- 

 ble compared to the benefit it receives in the 

 day, 2 1 7 



VIII. Ex* 



