Of Quadrupeds. 
21 
only Lap, their Gulet not being Mufcular enough to carry 
up much at once. 
Thefeverai Parts of the Gulet, have their diftinct Ufes. 
The outer Membrane, is both a Fence, and a Swath to all 
the reft 3 efpecially to the Mufcular. For the Nervous un- 
derneath, being always capable of, and fometimes fubject 
to inordinate expanfions (as Dr. Willis doth well conjecture) 
it would Rack the Mufcular Membranes beyond their 
Tone, were they not bound up within this. 
The two Mufculars, chiefly fubferve the feveral Motions 
of the Gulet. Amongft which, Dr. Willis reckons Ofcitation 
or Yauning, and Expuition. Of the firft, (a) his words are (*) Pha?- 
thefe 3 In Ofcitatione, Oefophagi duftum ampliari, <&* quafi a ™ a ^ Ratlon - 
vento quodam inflari <& expand i fentimw. But who knows 
not, that the Windpipe, and not the Gulet, is the part con- 
cern'd in all kinds of Refpiration, whereof Ofcitation is one. 
Of the latter, his words are thefe 3 (b) Guide Tunica carnofa, (b) ibid, 
duplex quafi Muf cuius cenferi debet 3 quorum alter*, expuitio- 
nis opus per fidt. At that time forgeting, that no man ever 
fpat any thing out of his Stomach 3 no more than he can be 
faid to vomit or eructate out of his Mouth. The Doctor 
is one, of whom I have learned much : and therefore I 
mention thefe Things, only becaufe they lie in my way : 
and that we may ftill remember, Nullius in Verba. 
The Actions of the Gulet are therefore principally thefe 
Three, Deglutition, Vomition, and Eructation. By one of the 
Mufcular Membranes, faith the forementioned Doctor, 
fc . that which defcends , Deglutition is performed 3 by the 
afcendent, Vomition. His words (c) are thefe, Cum unius Fi- (c)ibid. 
hrarum ordo defcendens,Deglutitioni inferviat, alter afcendens, 
Vomitionis opus perficit. But that he was herein miftaken, I 
conceive,appears from the ftructure of the faid Membranes, 
neither of which, is afcendent or defcendent, more than the 
other 3 and from the manner of their Contexture, as is 
above defcrib'd. Befides, if it were fo, why fhould there 
not be Afcendent and Defcendent Fibers or Mufcules, for 
the Natural, and the Inverted Motions alfo of the Guts ¥ 
I conceive therefore, That Deglutition and Vomition are 
made by the Cooperation of both the faid Membranes : 
only in the former, the Motion goes from the Throat 
downward, in the latter, from the Stomach upward. And 
