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. That same humming Noise,
which _many flying Insects_ make, not so much by the Wings, (for when
they are cut off, the humming still remains) as by a most swift and
brisk Motion of certain Muscles, hid in the Cavity of their Breasts,
seems to have somewhat of an affinity to the _Voice_; wherefore I
desire the Learned to examine, whether those small _Muscles, which are
proper to the Cartilages of the Wind-pipe_, cannot perform somewhat
like to that.

Many more Particulars concerning the _Voice_ might yet further be
inquired into, such as, how it is, that every one may be known by his
_Voice_? How that _Sound_, which in Singing is called _Quavering_, or
_Trilling_, by a peculiarity, is excited, &c, But seeing that these
things do not properly respect the nature of the _Voice_, I, for
Brevities sake, do omit them.




CHAP. II.


_Expounding the Nature of the_ Letters, _and the manner how they are
formed_.

Hitherto we have treated concerning the _Voice_ and _Breath_, and of
the manner of the formation of both of them, in general; now let us
see how the said _Voice_ and _Breath_ are, as a fit Matter for them,