[ 70 ] 



« 



will render the air of the jar worfe 

 than the air of the room. If, after 

 a few hours, you invert the experi- 

 ment, by placing the plant which 

 Hood at the window in the made, 

 and that which Hood in the made 

 near the window, the reverfe will 

 take place, viz. the air of the jar, 

 which was improved, will be found 

 worfe than the air of the room ; 

 and the air of the jar, which had 

 been contaminated, will be found 

 corrected again. And this remark- 

 able property of plants, in the way 

 juft mentioned, may be demonftrated 

 in a few hours. See experiment 



45* 



SEC- 



