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than once, without even fufpedting 

 the caufe of it. Dr. Prieflley ob- 

 ferved this remarkable oftenfivenefs 

 of the hot-houfes with a more phi- 

 lofophical attention ; he tried the air 

 within them, and found it worfe 

 than common air. 



By all this it feems evident, that 

 it would not be fafe to fleep in a 

 clofe hot-houfe; that it would not 

 be prudent to keep too many green 

 branches, fruit, or flowers, in any 

 room by night, particularly in that 

 of a lick perfon. 



The beft phyficians have, indeed, 

 often recommended to put green 

 branches of lime-trees and others in 

 the rooms of their patients, without 

 ever fufpecting any other effecT: but 

 benefit from them. I think frill, 

 that fome benefit may arife from 

 putting, in a clear day, frefh green 



branches 



