Hamajlatics. 123 
want of a free PalTage from the Arteries to the 
Veins. 
16. When I fixed the abovementioned 
Tube to the Vena Porta o( another Dog, fo 
as to make the Water pafs thro* it to the Guts, 
having then flit open a part of a Gut as be- 
fore deferib’d, Numb. ii. I found the Water 
ouzed plentifully thro* the whole mucofe Coat 
into the Gut ; whence we fee there isa Paflage 
for the Chyle to pafs immediately from the 
Cavity of the Guts into the mefenteric Veins. 
17. Yet when e contra a Tube was fixed to 
the Cavity of a Gut and warm Water poured 
in, no Water would pafs thence into thofc 
Veins, tho* the Column of Water which 
preflTed to enter, was of feveral Lengths from • 
one to p+J Feet high; the Entrance of the 
Water being hindred by the connivant Valves 
which cover the Orifices of thofe capillary 
Veins, which opening obliquely into the In- 
teftines, their Orifices are comprefled by the 
incumbent Water : Were it not for this wife 
Precaution, very grofs and noxious Particles of 
the Contents of the Bowels would have been 
impelled thro* thefe Veins and the ladeal 
Veflds, into the Habit of the Body, and that 
in greateft Abundance, when the Guts were 
moll 
