_
when some Impediment interposing, doth divide the _ordinary Sound_
into two; if therefore those parts are equal, either of them is by one
_Eighth_ more sharp than the former Sound, neither are they
distinguished from one another; but if they prove to be unequally
divided, then two _distinct Sounds_ are made at the same time, whereof
one is flatter than the ether, and this is commonly called a _broken
Voice_: But why our _Voice_ should fail us, when we endeavour to make
it more sharp, or more flat than it ought to be, the reason is,
because we strive either so to contract the _Cleft_ of the
_Wind-pipe_, and to press the _Spout-like Cartilage_, by help of the
_Bone of Tongue_, towards the _Epiglott_, that the going forth of the
_Voice_, and of the _Breath_, may be precluded, or else, on the
contrary, because that the said _Cleft_, through the drawing down of
the _Cartilages_, is so much widened, that the departing out of the
_Breath_, finds no hinderance.
But here I had almost forgot to compare the _more dry_, the _more
moist_, the _more solid_, and the _more thin_ Constitution of the
_Larynx_, or _Wind-pipe_, which also make very much to the rendering
the _Voice_, to be either sharp, or flat.
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