+185. Argument by Inference.+—The statement of a fact may be introduced into an argument, not because the fact itself applies directly to the proposition we wish to prove, but because it by inference suggests a general theory which does so apply. Though the reader may not be conscious of it, the presence of this general theory may influence his decision even more than the explicit statement of the general theory would.
An argument implies that there are two sides to a question. Which you shall take depends on the way you look on it, that is, on what may be called your mental point of view. Therefore any fact, allusion, maxim, comparison, or other statement which may cause you to look at the question in a different light or from a different point of view may be used as an argument. In effect, it calls up a general theory whose presence affects your decision. Notice how brief the argument is in the following selection from Macaulay:—
Many politicians of our time are in the habit of laying it down as a self-evident proposition, that no people ought to be free till they are fit to use their freedom. The maxim is worthy of the fool in the old story, who resolved not to go into the water till he had learned to swim. If men are to wait for liberty till they become wise and good in slavery, they may indeed wait forever.
—Macaulay: Milton.
+186. Summary.+—To summarize the preceding paragraphs, the authority we quote, the maxims we state, the facts we adduce become valuable because they appeal to general theories already believed by the reader. Success in argument demands, therefore, that we consider carefully what theories may probably be in the mind of our audience, and that we present our argument in such a way as to appeal to those theories.
+Theme CII.+—Write a short argument, using one of the following:—
1. A young boy is urging his father to permit him to attend an entertainment. Give his reasons as he would give them to his father.
2. Suppose the father refuses the request. Write out his reasons.
3. Try to convince a companion just entering high school to take the college preparatory course instead of the commercial course.
(Are your reasons true and pertinent? To what general theories have you appealed? Consider the coherence of each paragraph.)