concentric state.

These three _a_'s derived from primitive _a_ become each in turn the
progenitor of a family with triple sounds, as may be seen in the
following genealogical tree:


A
Á A À
---------------------------
é o e

è au eu

i ou u

Eccentric. Normal. Concentric.


This is the only simple sound, but four other sounds are derived from
it. The three _a's_ articulated by closing the uvula, give the nasal
_an_. Each family also gives its special nasal sound: _in_ for the
eccentric voice, _on_ for the normal state, _un_ for the concentric. All
other sounds are derived from combinations of these. 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