2 44 Anctlyfis of the Air. 
with more capacious veffels, it would deter- 
mine the matter pretty accurately $ becaufe 
by this artifice frefh air is drawn into the 
lungs at every infpiration, as well as in the 
free open air. 
Experiment CX. 
I made ufe of the fyphon (Fig. 39.) tak- 
ing away the bladders, and diaphragms ii 
n no: I fixed by means of a bladder one 
end of a fhort leaden fyphon to the lateral 
fofiet i i: Then I fattened the large fyphon . 
in a veflel, and filled it with water, till it 
rofe within two inches of 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 o- 
ther leg 0 s of the great fyphon, I whelmed 
another large empty receiver, whofe capa- 
city was equal to 1224 cubicle inches 5 the 
mouth of the receiver being immerfed in 
the water, and gradually let down lower 
and lower by an affiftant, as the water a- 
feended 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 valve b i flopping its return 
z down 
