In the public lecture the element of entertainment enters prominently.
The audience, at first in a passive state, must be awakened, and taken
on with the speaker. Probably it must be instructed, perhaps amused.
The speaker must make his own occasion. He has no help from the
circumstance of predisposition among his auditors. He must compel, or
he must win; he must charm or thrill; or he must do each in turn.
Animation, force, beauty, dramatic contrast, vividness, variety, are
the qualities that will more or less serve, according to the style of
the composition. Aptness in the story or anecdote, facility in graphic
illustration, readiness in expressing emotion, happiness in the
imitative faculty, for touching off the eccentric in character or
incident, are talents that come into play, and in the exercise of
these, gesture of course has an important place.

—George Jacob Holyoake, Public Speaking and Debate.

The very name of logic is awesome to most young speakers, but so soon as they come to realize that its processes, even when most intricate, are merely technical statements of the truths enforced by common sense, it will lose its terrors. In fact, logic[25] is a fascinating subject, well worth the public speaker’s study, for it explains the principles that govern the use of argument and proof.

Argumentation is the process of producing conviction by means of reasoning. Other ways of producing conviction there are, notably suggestion, as we have just shown, but no means is so high, so worthy of respect, as the adducing of sound reasons in support of a contention.

Since more than one side of a subject must be considered before we can claim to have deliberated upon it fairly, we ought to think of argumentation under two aspects: building up an argument, and tearing down an argument; that is, you must not only examine into the stability of your structure of argument so that it may both support the proposition you intend to probe and yet be so sound that it cannot be overthrown by opponents, but you must also be so keen to detect defects in argument that you will be able to demolish the weaker arguments of those who argue against you.

We can consider argumentation only generally, leaving minute and technical discussions to such excellent works as George P. Baker’s "The Principles of Argumentation," and George Jacob Holyoake’s "Public Speaking and Debate." Any good college rhetoric also will give help on the subject, especially the works of John Franklin Genung and Adams Sherman Hill. The student is urged to familiarize himself with at least one of these texts.

The following series of questions will, it is hoped, serve a triple purpose: that of suggesting the forms of proof together with the ways in which they may be used; that of helping the speaker to test the strength of his arguments; and that of enabling the speaker to attack his opponent’s arguments with both keenness and justice.

TESTING AN ARGUMENT

I. The Question Under Discussion

1. Is it clearly stated?

(a) Do the terms of statement mean the same to each
disputant? (For example, the meaning of the term "gentleman" may not
be mutually agreed upon.)

(b) Is confusion likely to arise as to its purpose?

2. Is it fairly stated?

(a) Does it include enough?

(b) Does it include too much?

(c) Is it stated so as to contain a trap?

3. Is it a debatable question?

4. What is the pivotal point in the whole question?

5. What are the subordinate points?

II. The Evidence

1. The witnesses as to facts

(a) Is each witness impartial? What is his relation to the
subject at issue?

(b) Is he mentally competent?

(c) Is he morally credible?

(d) Is he in a position to know the facts? Is he an
eye-witness?

(e) Is he a willing witness?

(f) Is his testimony contradicted?

(g) Is his testimony corroborated?

(h) Is his testimony contrary to well-known facts or general
principles?

(i) Is it probable?

2. The authorities cited as evidence

(a) Is the authority well-recognized as such?

(b) What constitutes him an authority?

(c) Is his interest in the case an impartial one?

(d) Does he state his opinion positively and clearly?

(e) Are the non-personal authorities cited (books, etc.)
reliable and unprejudiced?

3. The facts adduced as evidence

(a) Are they sufficient in number to constitute proof?

(b) Are they weighty enough in character?

(c) Are they in harmony with reason?

(d) Are they mutually harmonious or contradictory?

(e) Are they admitted, doubted, or disputed?

4. The principles adduced as evidence

(a) Are they axiomatic?

(b) Are they truths of general experience?

(c) Are they truths of special experience?

There would be no end were I to expatiate to the limit of my inclination on the subject of the gift of speech and its utility. I shall pass, therefore, to the following question, "Whether rhetoric be an art?" Those who wrote rules for eloquence doubted so little its being so, that they prefixt no other title to their books than "The art of speaking." Cicero says that what we call rhetoric is only an artificial eloquence. If this were an opinion peculiar to orators, it might be thought that they intended it as a mark of dignity attached to their studies, but most philosophers, stoics as well as peripatetics, concur in this opinion. I must confess I had some doubt about discussing this matter, lest I might seem diffident of its truth; for who can be so devoid of sense and knowledge as to find art in architecture, in[Pg 30] weaving, in pottery, and imagine that rhetoric, the excellence of which we have already shown, could arrive at its present state of grandeur and perfection without the direction of art? I am persuaded that those of the contrary opinion were so more for the sake of exercising their wit on the singularity of the subject than from any real conviction.