[ xlviii ] 



the lungs is infected by fixed aifj 

 which being immediately abforbed 

 by the contact with lime-water, the 

 dephlogifticated air is reitored very 

 near to its former purity. Inftead 

 of the bended tube juft mentioned, 

 the top of the receiver may be made 

 as the neck of a bottle, and a tube 

 may be fixed to it, having a cock to 

 open and fhut the pafTage as re- 

 quired. 



We confume, by each infpiration, 

 about 30 cubic-inches of air; and 

 thus, allowing 15 inspirations for a 

 minute, we confume each minute 

 450 cubic-inches of ain The Abbe 

 Fontana found, that the dephlogilti- 

 cated air being, after each refpira- 

 tion, purified again by the lime- 

 water, will remain good about thirty 

 times as long as it would when 

 breathed in the ordinary way ; and 



that 



