The Collected Works of Dale Carnegie. Dale Carnegie

words literally—and are willing to run the risk of his indignation at being wilfully misunderstood—you will to the best of your ability picture to him this familiarly wonderful machine. If you explain it to him, you are not describing but expounding it.

      The chief value of example is that it makes clear the unknown by referring the mind to the known. Readiness of mind to make illuminating, apt comparisons for the sake of clearness is one of the speaker's chief resources on the platform—it is the greatest of all teaching gifts. It is a gift, moreover, that responds to cultivation. Read the three extracts from Arlo Bates as their author delivered them, as one passage, and see how they melt into one, each part supplementing the other most helpfully.

      Analogy, which calls attention to similar relationships in objects not otherwise similar, is one of the most useful methods of exposition. The following striking specimen is from Beecher's Liverpool speech:

      A savage is a man of one story, and that one story a cellar. When a man begins to be civilized he raises another story. When you christianize and civilize the man, you put story upon story, for you develop faculty after faculty; and you have to supply every story with your productions.

      Discarding is a less common form of platform explanation. It consists in clearing away associated ideas so that the attention may be centered on the main thought to be discussed. Really, it is a negative factor in exposition though a most important one, for it is fundamental to the consideration of an intricately related matter that subordinate and side questions should be set aside in order to bring out the main issue. Here is an example of the method:

      I cannot allow myself to be led aside from the only issue before this jury. It is not pertinent to consider that this prisoner is the husband of a heartbroken woman and that his babes will go through the world under the shadow of the law's extremest penalty worked upon their father. We must forget the venerable father and the mother whom Heaven in pity took before she learned of her son's disgrace. What have these matters of heart, what have the blenched faces of his friends, what have the prisoner's long and honorable career to say before this bar when you are sworn to weigh only the direct evidence before you? The one and only question for you to decide on the evidence is whether this man did with revengeful intent commit the murder that every impartial witness has solemnly laid at his door.

      Classification assigns a subject to its class. By an allowable extension of the definition it may be said to assign it also to its order, genus, and species. Classification is useful in public speech in narrowing the issue to a desired phase. It is equally valuable for showing a thing in its relation to other things, or in correlation. Classification is closely akin to Definition and Division.

This question of the liquor traffic, sirs, takes its place beside the grave moral issues of all times. Whatever be its economic significance—and who is there to question it—whatever vital bearing it has upon our political system—and is there one who will deny it?—the question of the licensed saloon must quickly be settled as the world in its advancement has settled the questions of constitutional government for the masses, of the opium traffic, of the serf, and of the slave—not as matters of economic and political expediency but as questions of right and wrong.

      Analysis separates a subject into its essential parts. This it may do by various principles; for example, analysis may follow the order of time (geologic eras), order of place (geographic facts), logical order (a sermon outline), order of increasing interest, or procession to a climax (a lecture on 20th century poets); and so on. A classic example of analytical exposition is the following:

      In philosophy the contemplations of man do either penetrate unto God, or are circumferred to nature, or are reflected or reverted upon himself. Out of which several inquiries there do arise three knowledges: divine philosophy, natural philosophy, and human philosophy or humanity. For all things are marked and stamped with this triple character, of the power of God, the difference of nature, and the use of man.

—Lord Bacon, The Advancement of Learning.[16]

      Division differs only from analysis in that analysis follows the inherent divisions of a subject, as illustrated in the foregoing passage, while division arbitrarily separates the subject for convenience of treatment, as in the following none-too-logical example:

      For civil history, it is of three kinds; not unfitly to be compared with the three kinds of pictures or images. For of pictures or images, we see some are unfinished, some are perfect, and some are defaced. So of histories we may find three kinds, memorials, perfect histories, and antiquities; for memorials are history unfinished, or the first or rough drafts of history; and antiquities are history defaced, or some remnants of history which have casually escaped the shipwreck of time.

—Lord Bacon, The Advancement of Learning.[16A]

      Generalization states a broad principle, or a general truth, derived from examination of a considerable number of individual facts. This synthetic exposition is not the same as argumentative generalization, which supports a general contention by citing instances in proof. Observe how Holmes begins with one fact, and by adding another and another reaches a complete whole. This is one of the most effective devices in the public speaker's repertory.

Take a hollow cylinder, the bottom closed while the top remains open, and pour in water to the height of a few inches. Next cover the water with a flat plate or piston, which fits the interior of the cylinder perfectly; then apply heat to the water, and we shall witness the following phenomena. After the lapse of some minutes the water will begin to boil, and the steam accumulating at the upper surface will make room for itself by raising the piston slightly. As the boiling continues, more and more steam will be formed, and raise the piston higher and higher, till all the water is boiled away, and nothing but steam is left in the cylinder. Now this machine, consisting of cylinder, piston, water, and fire, is the steam-engine in its most elementary form. For a steam-engine may be defined as an apparatus for doing work by means of heat applied to water; and since raising such a weight as the piston is a form of doing work, this apparatus, clumsy and inconvenient though it may be, answers the definition precisely.[17]

      Reference to Experience is one of the most vital principles in exposition—as in every other form of discourse.

"Reference to experience, as here used, means reference to the known. The known is that which the listener has seen, heard, read, felt, believed or done, and which still exists in his consciousness—his stock of knowledge. It embraces all those thoughts, feelings and happenings which are to him real. Reference to Experience, then, means coming into the listener's life.[18]

      The vast results obtained by science are won by no mystical faculties, by no mental processes, other than those which are practised by every one of us in the humblest and meanest affairs of life. A detective policeman discovers a burglar from the marks made by his shoe, by a mental process identical with that by which Cuvier restored the extinct animals of Montmartre from fragments of their bones. Nor does that process of induction and deduction by which a lady, finding a stain of a particular kind upon her dress, concludes that somebody has upset the inkstand thereon, differ in any way from that by which Adams and Leverrier discovered a new planet. The man of science, in fact, simply uses with scrupulous exactness the methods which we all habitually, and at every moment, use carelessly.

      —Thomas Henry Huxley, Lay Sermons.

      Do you set down your name in the scroll of youth, that are written down old with all the characters of age? Have you not a moist eye? a dry hand? a yellow cheek? a white beard? a decreasing leg? an increasing belly? is not your voice broken? your wind short? your chin