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fhall bring under this Head. The Mouth alfoisbut 
moderately opened ; not by the Adion of the Muf- 
cles that ferve to pull down the lower Jaw (becaufe 
when they ad they open the Mouth pretty wide), 
but by the Remiflion of the Adion of thofe Mufcles 
which ferve to pull ir up 5 for this Maxim is necef- 
farily true, That, between the Adions of any 
Mufcle and its Antagonift, there mud be a Re- 
miflion of the former j fo that, as in the Cafe 
before us, the Remiflion is fometimes fufficient, 
without any Neceflity for the fubfequent Adfion 
of the Antagonift. The fame is obierved before, 
where we mention the Occipito-Frontalis and the 
Corn gator Coiteri- 
But, in order to render this Remiflion of the Tern- 
p oralis and Majfeter (which are the Mufcles ferving 
to draw up the Jaw) more eafily underftood, let us 
only obferve a Pcrfon fleeping in a Chair, with his 
Head leaning diredly backward, or upon his Back in 
Bed, at which time the Mind is quite undetermined 
to any Defign 5 we fhall fee the lower Jaw fall by its 
own Gravity 5 which cannot happen but by the Re- 
miflion alone of thofe Mufcles mention'd 5 becaufe 
the c Digaftricus, Fterigoidaus ext emus, and *Pte- 
rigoidaus internus, which ferve to open the Jaw, are 
as much at Reft as the former. This any one may 
prove, by leaning his Head back, and letting his 
Jaw fall fpontaneoufly as far as it will go 5 and then, 
by bringing thofe Mufcles juft mentioned into Adion, 
he will be able to pull it down yet lower. But if a 
Man's Head leans forward on his Bread in a Chair, 
or if in Bed hi* Bolftcr and Pillow be high while he 
fleeps, 
