STATISTICS. Statistics improperly used are dry and uninteresting; they often spoil an otherwise forceful and persuasive debate. The trouble often lies, strange to say, in the accuracy with which the figures are given. A brain that is already doing its utmost to accept almost instantaneously a multitude of facts and comprehend their significance, or a brain that is somewhat sluggish and lazy, refuses to be burdened with uninteresting and unimportant details. For this reason, when a debater speaks of 10,564,792 people, the brain becomes wearied with the numbers and in disgust is apt to turn away from the whole matter. On the other hand, the round sum 10,000,000 not only does not burden the brain, but also, under ordinary conditions, gives in a rather forceful manner the information it was intended to convey. "About five hundred" presents a much more vivid picture than "four hundred and eighty-six" or "five hundred and eighteen"; "fifteen per cent." is stronger than "fifteen and one-tenth per cent."; the expression "eighty years" seems to indicate a longer period of time than "eighty-two years, seven months, and twenty-nine days."
If one is to quote statistics, he should always, unless the circumstances be very unusual, use round numbers. Figures themselves, however, are often less emphatic than other methods of expression. The ordinary mind can not grasp the significance of large numbers. That the state of Texas contains over a quarter of a million of square miles means little to the average person; he neither remembers the exact area of other states nor can he realize what an immense territory these figures stand for. The following quotation gives the area of Texas in much more vivid and forceful language:—
If you take Texas by the upper corner and swing it on that as a pivot, you will lop off the lower end of California, cut through Idaho, overlap South Dakota, touch Michigan, bisect Ohio, reach West Virginia, cut through North Carolina and South Carolina, lop off all the western side of Florida, and blanket the greater part of the Gulf of Mexico.
To say that the American farmer produced in 1907 a crop worth, at the farm, seven and one-half billions of dollars, conveys little idea of the magnitude of the harvest. A current magazine has couched the same estimate in less exact but in far more emphatic language:—
Suppose that all of last year's corn had been shipped to Europe; it would have required over four thousand express steamers of 18,000 tons register to deliver it. Suppose that the year's wheat had all been sent to save the Far East from a great famine: the largest fleet in the world, with its four hundred vessels of all sizes, would have required fifteen round trips to move it. Take tobacco,—such a minor crop that most people never think of it in connection with farming:— if last year's tobacco crop had been made into cigars, the supply would have lasted 153,000 men for fifty years, each man smoking ten cigars a day.
The officials of the forestry service, in speaking of the great devastation caused by forest fires, make the startling assertion that a new navy of first-class battle-ships could be built for the sum lost during a few weeks in the fires that raged from the pines of Maine to the redwoods of California.
Figures used in this way are most effective, and yet probably nothing in argumentation is more tedious than too many of these descriptions of statistics coming close together. If numbers absolutely have to be indicated a great many times, even figures are likely to be less tiresome.
CONCRETENESS. General statements and abstract principles invariably weary an audience. Theories and generalities are usually too intangible to make much impression. Specific instances and concrete cases, however, are usually interesting. A vivid picture of real persons, things, and events is necessary to arouse the attention of an audience and cause them both to understand the argument and to give it their consideration. The slogan of a recent political campaign was not, "Improved economic conditions for the laboring man"; it was, "The full dinner pail." The political orator who is urging the necessity for a larger navy on the ground that war is imminent does not speak of possible antagonists in such general terms as foreign powers; he specifies Germany, Japan, and the other nations that he fears. The preacher who would really awaken the conscience of his church does not confine himself to such terms as original sin and weaknesses of the flesh; he talks of lying, stealing, and swearing.
Compare the effectiveness of the following examples:—
People of the same race are more loyal to each other than to foreigners.