EXPERIMENTS 



UPON 



VEGETABLES, 



DISCOVERING 



Their great Power of purifying the 

 Common Air in the Sun-mine., 



AND OF 



Injuring it in the Shade and at Night. 



TO WHICH IS JOINED, 



A new Method of examining the accurate 

 Degree of Salubrity of the Aimofphere. 



By JOHN INGEN-HOU5Z, 



Counfellor of the Court and Body Phyfician 



to their Imperial and Royal Majesties., 



F. R. S, &c &c. 



LONDON: 



Printed for P. ELMSLY, in the Strand; 

 and H. PAYNE, in Pall Mall. 1779. 



