2 66 Analyjis of the Air. 



phragms, before it could be infpired into my 

 lungs again. The whole capacity of the 

 bladders and fyphon was 4 or 5 quarts. 



Common fea-falt, and Sal Tartar, being 

 ftrong imbibers of fulphureous fleams, 1 dip- 

 ped the four Diaphragms in ftrong folutions 

 of thofe falts, as alfo in white- wine vinegar, 

 which is looked upon as a good anti-pefti- 

 lential : Taking care after each of thefe Ex- 

 periments to cleanfe the fyphon and bladder 

 well from the foul air, by filling them with 

 water. 



I could breathe to and fro the air inclofed 

 in this inftrument for a minute and half, 

 when there were no Diaphragms in it \ when 

 the four Diaphragms were dipped in vinegar, 

 three minutes ; when dipped in a ftrong folu- 

 tion of fea-falr, three minutes and an half. 

 In a Lixivium of Sal Tartar, three minutes ; 

 when the Diaphragms were dipped in the 

 like Lixivium, and then well dried, five mi- 

 nutes ; and once 8 -f- \ minutes, with very 

 highly calcined Sal Tartar -, but whether 

 this was owing to the Tartar s being greatly 

 calcined, whereby it might more ftrongly 

 attract fulphureous grofs vapours, or whe- 

 ther it was owing to the bladder and fyphon's 

 being intirely dry, or whether it was occa- 



fioned 



