C ^38 ) 
apt to ferment with it, and-then both confpire to break 
and diflolve the groffer and more ftubborn Parts. And 
Galen^m the Book I have before-mentioned, plainly allows 
that the Saliva is concern d irj theBufmefs of Concoc2ion, 
tho' he fuppofcs the Alteration, which is produc d by 
this Juice, to be made in the Mouth, as appears from 
thefe Words : Qu£ (alteratio) in ore agitur mutat qui Jem 
id {nutrmentum) in alteram fpeciem manifefli^ non ta- 
men ad perfeiiionem tranfmutat • Qui manfi fmt Ciht 
primum quidem hie Pituiti {oris) imlumtur^ & cum ek 
mifcentur^—^ Itaque majorem mutationem confecuti funt^ 
quam iiy qui in vacnb dentium intervaSis fuere im- 
paili. 
Now I have given this fliort Account of the various 
Opinions of fome Ingenious Men, concerning the Man- 
ner how Concodion is performed ; I come now to pro- 
pole my own ttypothefis, by which I fliall endeavour 
to explain it. 
In order to the more eafie and effeftual Digeftion of 
the Food, Nature has appointed (ome Parts for the break- 
ing our Aliment, and reducing whatever is grofs into 
fmaller Parts, before it is put upon Digeftion: Others 
to fupply the Ferment, by which it is to be diflblv'd 
and concofted, and which, before it comes to be inclu- 
ded in the Stomack, does moiften, and make it more 
Ibft, that it may more eafily be penetrated and broken 
by thofe Parts which ferve to divide every Morfel into 
fmaller Pieces, and prevents the Inconvenience and Trou- 
ble which would arife from the Nourifliment flicking 
about or between them, when it is dry or vifcous. 
For the breaking of that part of our Food, which is 
not liquid, Nature has furnifli'd us with Teeth, and 
thofe of two forts : For fome are ordain'd to divide and 
break 
