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Anahfis of the Air. 



240 



I cut afundcr the bodies of fcvcral young 

 and fmall animals ju It below the ^Diaphragm, 

 and then taking care not to cut any veflei 

 belonging to the lungs, I Jaycd the Thorax 

 open by taking away the "Diphragm, and 

 fo much of the tibs, as was needful to cx- 

 pofe the lungs to full view, when blown 

 up. And having cut off the head, I faftned 

 the windpipe to a very fhort inverted leg of 

 a glafs fyphon \ and then placed the inver- 

 ted lungs and fyphon in a large and deep < 

 glafs veflei a: full of water (Fig. 32.) un- • 

 der the air pump receiver p p, and palling 

 the longer leg of the fyphon thro' the top of 

 the receiver, where it was cemented faft at 

 z, as I drew the air out of the receiver, the 

 lungs dilated, having a free communica- 

 tion with the outward air, by means of the 

 glafs fyphon ; fome of which air would 

 here and there pafs in a few places thro' 

 the fubftance of the lungs , and rife infmali 

 ftreams thro' the water , when the receiver 

 was exhaufted no more than to make the 

 Mercury in the gage rife lefs than two inch- 

 es. When I exhaufted the receiver, fo as 

 to raife the Mercury 7 or 8 inches, tho' it 

 made the air rufh with much more violence 

 » 1 . thro' 





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