The mouth cannot
possibly produce more than three families of sounds, and in each family
it is _a_ united with the others that forms the trinity.
The variety of sounds in these three families of vowels arises from the
difference of the opening of the mouth and lips in articulating them.
These different modes of articulation may be rendered more intelligible
by the subjoined diagrams:
_a_ is pronounced with the mouth very wide open, the uvula raised and
the tongue much lowered.
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O O
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_e, e, i_ and _in_ are articulated with the lips open and the back part
of the mouth gradually closed.
/
/
/
\
\
\
_a, au, ou_ and _on_ are articulated with the back of the mouth open and
the lips gradually closed.
\
\
\
/
/
/
_e, eu, u_ and _un_ are articulated with the back of the mouth and the
lips uniformly closed.
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The voice takes different names, according to the different sounds in
each family of vowels: the chest-voice, the medium voice and the
head-voice.
These names imply no change in the sort of voice, but a change in the
manner of emission. The head, medium or chest-voice, indicates only
variety in the emission of vowels, and may be applied to the high as
well as the deep and medium voice.
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