Anahjfis of the Air. 241 



rofe within two inches of a and covered 

 the other open end of the fhort fyphon., 

 which was depreffed for that purpofe. Over 

 this orifice I placed a large inverted chymi. 

 cal receiver full of water 5 and over the 

 other leg s of the great fyphon, I whelmed 

 another large empty receiver, whofe capacity 

 was equal to 1 224 cubick inches 5 the mouth 

 of the receiver being immerfed in the water ? 

 and gradually let down lower and lower by 

 an afliftant, as the water afcended in it. Then 

 flopping my noftrils, I drew in breath at a, 

 thro* the fyphon from the empty receiver: 

 And when that breath was expired, the val- 

 ve hi flopping its return down thro' the fy- 

 phon, it was forced thro* the valve r, and 

 thence thro* 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 5 or 

 6 cubick inches, out of the empty receiver at 

 0, the water at the fame time afcending 

 into it and filling it 5 by which means all 

 the air in the empty receiver, asalfoall the 

 air in the fyphon s b> was infpired into 

 my lungs, and breathed out thro' the valve 

 r into the receiver, which was at firft full 

 R of 



