f 241 ) 
guaks. Whereas if the Saliva were but ong more fim*' 
pie Liquor, a left Number of Glands might have been 
fufBcient. At leaft there appears no Reafon why one 
of every Pair Ihould difembogue it felf into the Mouth 
fo very near to the Orifice, by which a Gland of fome 
other Pair throws in its Juice ; and they are not rather 
all planted at more equal Diftances from one another, (b 
to flow in upon every part of the Aliment at the fame 
time. 
Not that I fuppofe, as there are four pair of falivatory 
Glands, fo there are four forts of Juices fupply'd from 
them, to make the Saliva ; but, as I hinted before, that 
there are only two different Juices, that conftitute it. 
And thefe are not only fuiBcient, but more proper to 
excite and fecure that Fermentation, which is neceffary 
toConcoftion. For we find that moft of thofe Fermenta- 
tions, which arife upon Mixtures made for Experiments, 
are produced from the Mixture of two things, and 
it is not fo eafie to find out three or four (iich Liquors of 
a different nature, as will, upon the Mixtion of them 
all, produce a Fermentation, and from the Omiffion of 
any one of them difcover no Di(cord or Difpofition to 
ferment. Befides, it is certain that two do better fecure 
the End, which Nature defigns. For, if there were 
three or four different Juices, of which the Saliva na- 
turally confifts, thefe muft all have their proper Quali- 
ties preferv'd to them, or elfe the Fermentation, which 
ihould arife between them, will not neceflarily follow 
upon their Mixture ; and it is certain, that there would 
be more Danger, that one of three or four fliould be 
deprived of its natural Quality, than one of two. 
What Nature thefe two Juices are of, I do not pre- 
tend pofitively to determine ; but fo far as I have been 
able to make my Conjectures about it from Experiments, 
I do think one of them to be an acid Juice i the other 
N n . an 
