Amlyfis of the Air. 249 
I cut afunder the bodies of fcvcral young 
and fmall animals juft below the diaphragm, 
and then taking care not to cut any vcftel 
belonging to the lungs , I layed the Thorax 
open by taking away the T)iphragmy and 
fo much of the ribs, as was needful to ex- 
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 veftel x 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 fall at 
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 i fome of which air would 
here and there paTs in a few places thro' 
the fubftance of the lungs , and rife in fmall 
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 ru(h with much more violence 
thro* 
