Analyjls of the An. 245 



down thro* the lyphon, it was forced thro' 

 the valve r, and thence through the fmall 

 leaden fyphon into the inverted receiver full 

 of water, which water defcended as the 

 breath afcended. In this manner I drew all 

 the air, except five or fix cubick inches, out 

 of the empty receiver at 0, the water at the 

 fame time afcending into it, and filling it ; 

 by which means all the air in the empty 

 receiver, as alfo all the air in the fyphon 

 s b was infpired into my lungs, and breathed 

 out through the valve r into the receiver, 

 which was at firft full of water. I marked 

 the boundary of air and water, and then 

 immerfed the whole receiver, which had 

 the breath in it, under water, and there gra- 

 dually poured the contained breath up into 

 the other full receiver, which flood inverted 

 over S' y whereby I could readily find whe- 

 ther the air had loft any of its elafticity : 

 And for greater furety, I alfo meafured the 

 bulk of breath, by filling the receiver with a 

 known quantity of water up to the above- 

 mentioned mark; making alfo due allow- 

 ance for a bulk of air, equal to the capacity 

 of the large fyphon s b, which was at laft 

 fucked full of water. 



R 3 The 



