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rofe within two inches of a and covered 

 the other open end of the fhort fyphon, 

 whieh was deprefled for that purpofe. Over 

 this orifice 1 placed a hrge 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 1224 cubicle inches ; the mouth 

 of the receiver being immerfedinthe water, 

 and gradually let down lower and lower by 

 an afiiftant, as the water afcended in it. Then 

 (topping my noftrils, I drew in breath at a, 

 thro' the fyphon from the empty receiver: 

 And when that breath was expired, the val- 

 ve bi Hopping 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; by which means all 

 a the air in the empty receiver, as aifoall rhe 

 air in the fyphon s b, was infpired into 

 my lungs, and breathed out thro' the valve 

 r into the receiver, which was at fir ft full 



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