[^90] 
( as. I have formerly faid ) fo the nutritive Juice alfo may 
pafs thro the thrcddy Coats of the blood,water,andmilk- 
veffels: and in the fame manner, the fmall Branches of 
the veins may take up fubftances out of the Bowels, and 
carry them to the heart. 
- This will not feem ftrarige when we confider, that if 
<L milkjWater, or blood-v^flel, be a thoufand times lefs 
than a hair of ones head, the Coats of them muft needs 
be very thin, and the threds whereof the Coats are made 
yet thinner. How ealy muft moifture pafs thro the fides 
of fuch Veflels ; efpecially when the matter which is to 
enter into the velGTels is thinner than that which is alrea- 
dy contained in them. 
It has been objeded, that while the paffageinto the 
VefTels is fo open, a quantity oi Air and Wind may 
alfo get into them. Now that you may fee how that 
the moifture may pafs out of the Bowels into the Veins, 
and the wind not pafs, I made this following tryaU I 
took an Ox Bladder, blew^ it up, and let it dry as Figure 
6. J.h* C. D. I then took a piece of a Hog's Gut made 
clean, about the length of a fpan, and tied it up at E. 
then I put into it water, till the Gut was about a quarter 
full: Afterwards I forced in three quarters more of Air, 
binding it f aft at the Gut then lay upon the Bladder as 
E. E I then hung them in a Ch mney where was made 
but little fire, and I found that the water in the Gut did 
not only moiften the Bladder, where it touched it, but 
ran down in two Channels by the-fide of the bladder ; in 
the fpace of fixteen hours all the moifture m the Gut was 
run out, without the leaft Air, nay the Gut feemed as 
ftiff, as when it was firft blown. 
Let us now compare the Guts to the Bladder, and the 
Chyle and Wind in the Guts, to the wind and water in 
the hogs gut, then ftiallthe Guts let the moifture pals 
through them, but not the Air. 
Among the aforefaid blood-veflels and other veflels 
lying 
