The Stomachs and Guts. 
fo in EruHation, only with lefs force. For the performance 
of which Ac tions, Two Mufcules or Mufcular Membranes 
are yet requifite; and thofe platted and interchanged, as 
hatlr been defcrib’d : That is, by a double Plat of the Fi¬ 
bers of both ; whereby half the nether Membrane on the 
one fide the Gulet, becomes half the upper Membrane on 
the other fide: and fo vice verfa, in fpiral rounds through¬ 
out. To the end, That the Gulet being hereby contracted 
in one part, and dilated in the next,might at the fame time, 
thruft forward, and let pafs, any body therein contain’d: 
and that the Paid Contractions and Dilatations might be 
more eafily and regularly made, and by reciprocal "Undula¬ 
tions , carry’d on from one end of the Gulet to the other. 
Thefe Undulations , in the Gulet of a Horjfe , when lie drinks, 
are very plainly feen. 
And that this Undulation may be made with more fpeed, 
it is obfervable, That the Paid Mufcular Fibers are not con¬ 
tinu’d by a clofe, but very oblique or open fpiral Line. 
Whereby, as the fpiral Rounds or Circuits, f o the Undula¬ 
tions, are the fewer ; and confequently, not (lowly (as in 
the Guts) but much fooner finifhed. 
Hence it is, That a Cat hath fo difficult a fwallow, the 
meat commonly feeming to flick in her Throat. Not from 
the fmallnefs of her Gulet 5 but for that in the longer half 
of it, the Mufcular Fibers are continu’d in fo clofe a fpiral 
Line, as rather tofeem Annular. Whereby, the Undulati¬ 
ons of the Gulet are more (lowly and difficultly made. So 
that a more difficult fwallow, being one thing neceffary to 
make her not greedy, but patiently to watch for her Prey; 
Nature hath therefore contriv’d her Gulet for that pur- 
pole. 
The Nervous Membrane, or (as in fome Graminivorous 
Animals it may be call’d) Corpus Nervofum, hath hitherto 
been thought to ferve only for fenfe. Dr. Willis Con¬ 
jectures, That it is alfo the Inftrument of fome certain mo¬ 
tions of expanfion in Ofcitation and Preternatural Inflation: 
which is all he faith. 
But to Ale, it feemeth, That it Cooperates with the 
Mufcular Membrane to all the Natural Motions of the 
Gulet., in Deglutition , Vomition, and Eruciation. And, to 
fpeak properly, That ’tis nothing elfe but a HOLLOW 
TEN- 
