• C MO ) 
that Extremity, which (lands out of the Gums, by 
which means they retain feme Quantity of the Food 
between them every titre the lower Jaw is pulled up 
and forc'd againft the Maxilla fuperior. And as they 
are broad, fo they are formed with Inequalities and Pro- 
tuberances, and by the motion of the lower Jaw, from 
one fide towards the other, they grind what they have 
between them into pieces. The Pofition of thefe Teeth 
too is as convenient as that of the Incifores^ and the 
Dentes Canim : For being defign'd to break thofe pieces 
of cur folid Food, which are taken into the Mouth, and 
thefe pieces, when they are comprefs'd, and moved by 
the Dentes Molares, being apt to fly out of the Mouth, 
if there were no Contrivance to prevent it, they are 
placed beyond the Aperture of the Mouth, and oppo- 
fite to the Cheeks, which keep the Food within that Ca- 
vity, and not only fo, but prefs it in between the Den- 
ies Molar es on one fide, as the Tongue does on the other, 
until they have fufficiently broken and divided it. 
At the fame time, whilft the Dentes Molares arc 
breaking the Food, there flows into the Mouth a falival 
Juice which mixes with it, and not only (erves to 
moiften it, and to render it more apt and eafie to be di- 
vided, but feems to be the Ferment, by the Benefit of 
which the Food is diflblved and digefted. And therefore 
it is intimately mixed with it by the Teeth agitating or 
ftirring them together in maftication. 
This Liquor, which we commonly call the Saliva, or 
Spittle^ feems to be a Compofition made of two feveral 
Juices, very different in their Nature. And therefore 
the feveral Parts of it are feparated by their proper 
Glands, and Nature has planted no fewer than four pair 
about the Mouth, which fupply the Juices that make 
the Saliva ^ to wit, the Tarotides^ and the GlanduU 
Muckianay the GlanduU MaxiOares interna^ and Sullin- 
guales. 
