Now these Symptoms of the _Voice_
are also common to other _Wind-instruments_, when they become too much
moistned by any vapourous wetting Air. The same reason also is to be
assigned why the _Voice_ doth at last quite cease in those who have
made too long Harrangues, in speaking, and whose Jaws are quite dried
with an immoderate Heat; for in both these cases the top of the
_Wind-pipe_ is covered over with a clammy _Tenacious Phlegm_.
There remains yet two other Symptoms of the _Voice_, which I have
undertaken to explicate, viz. why the _Voice_ sometimes leaps from one
_Eighth_ to another; and, as it is rightly said by the Vulgar
Expression, that it is broken: and why, when we strive to make our
_Voice_ either too sharp, or too flat, it at last plainly faileth us.
As to the first, let us consider when and how it cometh to pass; and
first, it's what principally happeneth to _Orators_, when they
endeavour to lift up their _Voice_ too high, or strongly; but how this
cometh to be, _Organ-pipes_, and the _Monochorde_, do teach us, _viz.
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