C 903 T 
upon the Infpiration of Air do fweii up and grow 
round, and upon expiration do fall fomething flaccid, and 
abate fomething of that Figure, as theMicrofcope does 
plainly reprefent. That thefe Pipes Ihouid run to a great 
length hollow, tho 5 very fmall, I the Ms wonder at, 
having feen a hollow Pipe of Glafs drawn out at the flame 
of a Lamp Co very fmall as to be fcarcc vifible without 
a Microfcope, and yet wasfo hollow as to take up ting 
ed Spirit of Wine, where only the ordinary preflure or 
the Ambient Air impelled it. Nor will comprefs'd Air 
be kept out where there is the leaft Pore left open, which 
makes it more than probable that it ftiould insinuate into 
this Machine Co truly adapted to receive the Air, and 
that in great quantity, the Apparatus of Air-Veflels be- 
ing fo very confiderable, which appears in each infpira- 
tion for the Luugs are ftretch'd at that rate as to take 
up double the room they do in the ftate of expiration, 
or in their comprefsd ftate ; and even in this ftate the 
Air-bladders are not fully evacuated, but contain Air 
for good purpofes. Nor can it be pretended-that any 
augmentation is due to the Expanfion of the Blood- Vet 
fels, or any other which do not fsvell beyond their ufual 
Tenfion in each infpiration. The Sanguiferous Veflels 
are divaricated through all the Lobes of the Lungs, and 
do give a very clofe attendance to each Veficula ( for 
there is not the leaft Veficula but has a Capillary Veflel 
which intimately infinuates into it ) in order to receive 
fome confiderable benefit from it ; and this appears to 
the Eye, for in an inftant a dark and foul Blood is chang- 
ed into a bright florid Red Colour, which would make 
a Man of Contemplation to admire it, and a Lover of 
Red Wine, who is prefently offended to fee his Liquor 
foul, (and perhaps juftly condemns it for unwhclcfome ) 
wife for fuch another expedient to clear up his turbid 
Liquor, Thus the very ftru&ure of the Lungs, the ei- 
ie<a of change of Colour both in the Blood and in our 
Ccc 2. Ex- 
