reproductions of this chart affected by such or such a particular organ.
A knowledge of this criterion gives to our studies not only simplicity,
clearness and facility, but also mathematical precision.

In proposing the accord of nine formed by the figure 3 multiplied into
itself, it must be understood that we give the most elementary, most
usual and least complicated terms. Through natural and successive
subdivisions we can arrive at 81 terms. Thus multiply 9 by 3; the number
27 gives an accord of 27 terms, which can again be multiplied by 3 to
reach 81. Or rather let us multiply 9 by 9, and we in like manner obtain
81 terms, which become the end of the series. This is the alpha and
omega of all human science. _Huc usque venies, et ibi confringes
tumentes fluctus tuos._ ("Thus far shalt thou come, and here shall thy
proud waves be stayed.")

It is well to remark that this criterion is applied to all possible
phenomena, both in the arts and sciences. This is reason, universal
synthesis. All phenomena, spiritual as well as material, must be
considered under three or nine aspects, or not be understood. Three
genera and nine species; three and nine in everything and everywhere;
three and nine, these are the notes echoed by all beings. We do not fear
to affirm that this criterion is divine, since it conforms to the nature
of beings. Then, with this compass in hand, let us explore the vast
field of oratorical art, and begin with the voice.

NOTE TO THE STUDENT.--Do not go on without a perfect understanding of
this explanation of the criterion, as well as the exposition of our
method which closes the preface.