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# Title: Philosophical Principles Of Natural Religion (shelfmark Leibn. Marg. 53)
# Folio 214, page id 797370323:0372
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r4. DhioTophical principles
3ZXXVI. The Lunes are composd
ot an infinite number ot lictle Lohes, ot
disterent Pigures, and Magnitudes, but
F0 join d as to leare but (mall Vacuiries
betreen em. Fach Lohe consists ot an
infinier oE Emall sphericat Vesicles, form d
by the Coats oF che ImaII Branches oF the
Trachea: Co thac ther may be considered
ertien blonn up) as lo many fine Tubes
ending in litele hollon Spheres; upon the
Edes ot these Vesicles, the Blo0d V esels
in a Ane Net- work are Spread. Now betore
the faetus is broushe ta Liphe, thele Ve-
sicles lic Aac upon one anocher, and by
their pressure uxon the Bl00dVessels, hin-
der its progress chroughchem; but as LoOn
as this faetus enjorsthe benehe oF the RII,
by its reiohe and elastick Force, this Rir
ruthes in chrouxh the Pipes of che Trachea
inco chele resicles, and blors em up,
Wrhereby chey stand ercet uxon che Trunt
Of chelc licele W ind pipes, and sive a frec
palsase co the Bl0od chroreh these Vel
Tels, spread uxon their sides. And wrhen
by etic weiotic of che Thorax, and che
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ene
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