The _Voice_ therefore, as it is the _Voice_, is generated in the
_Cartilages of the Wind-pipe_, then afterwards is formed into such or
such _Letters_; but that it may become a lovely _Voice_, it's
requisite, that those Cartilages be _smooth_, and _lined with no
mucous Matter_, else the _Voice_ will become Hoarse, and sometimes be
utterly lost, viz. when they have lost their Springy power.
For _Pipes_; and other _Wind-Instruments_ do most notably explain to
us the nature of the _Voice_; for in them we see a certain _Voice_ or
_Sound_ to be generated out of Simple Air, whilst it is as it were,
rent in pieces, and forced into a tremulous Motion: Now, that in these
Instruments there is a little Tongue; or which is instead of a Tongue,
the same in a Man is the _Epiglott_, or Cover of the _Wind-pipe_, and
the _Uvula_, or Pallate of the Mouth; but the rest of the _Cartilages_
of the _Throat_, besides that, they contribute much to the making of
the _Voice_, yet are they chiefly serviceable to it, in rendering it
to be more flat, and more sharp, and that especially by the _Bone of
the Tongue_, and the adjoyning Muscles: But I am unwilling to put from
this Office the Muscles which are proper to the _Wind-pipe_; for they
all unanimously conspire to make the _Cleft of the Throat_ either
wider, or narrower.
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