240 /hahfis of the Air. 

 cubick inches of air, that will be 48000 cu~ 

 bick inches in an hour, at the rate of 20 in- 

 fpirations in a minute. A confiderablepart 

 of the elafticity of which air is, we fee 

 by the foregoing Experiment, conftantly de- 

 ftroyed, and that chiefly among the vefi- 

 cles, where it is charged with much vapour. 



But it is not eafie to determine how much 

 is deftroyed. I attempted to find it out by 

 the following Experiment, which I fhall here 

 give an account of, tho* it did not fucceed 

 fo well as I could have wifhed, for want of 

 much larger veiTels; for if it was repeated 

 with more capacious veffels, it would de- 

 termine 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 i i 

 n ?i 0: I fixed by means of a bladder one 

 end of a fliort leaden fyphon to the lateral 

 foffet i i : Then I fattened the large fyphon 

 in a veflel, and filled it with water, till it 



rofe 



