English: Composition and Literature

by W. F. Webster

The relation between cause and effect is so intimate that the occurrence of one may be regarded as a sure sign of the presence of the other. If an effect is produced by only one cause, the presence of the effect is a certain indication of the cause. If several causes produce the same effect, some other methods must be used to determine the cause operating in this special case.

Sequence and Cause. In reasoning from effect to cause, one must be sure that he is dealing with a cause. As effect follows cause, there is danger that anything that follows another may be considered as caused by it. Because a man died just after eating, it would not be quite reasonable to connect eating and death as cause and effect. The fact is that death is surer to follow starvation. The glow at evening is generally followed by fair weather the next day; but the fair weather is not an effect of a clear sunset. Common sense must be used to determine whether the relation is one of cause and effect; something more than a simple sequence is necessary.

Another argument from sign associates conditions that frequently occur together, though one is not the cause of the other. “James is near, because there is his blind father,” means that James always accompanies his father; where the father is, the son is too. If one had noticed that potatoes planted at the full of the moon grew well, and potatoes planted at other times did not thrive, he might say as a result of years [136] of observation that a certain crop would be a failure because it was not planted at the right time. This argument might have weight with ignorant people, but intelligent persons do not consider it a sure sign. All signs belong to this class of arguments; they are of value or worthless as they come true more or less frequently. Every time there is an exception the argument is weakened; another case of its working strengthens it. Where there is no sure relation like cause and effect, the strength of the argument depends on the frequency of the recurrence of the associated conditions.

A third argument from sign associates two effects of the same cause. A lad on waking exclaims, “The window is covered with frost; I can go skating to-day.” The frost on the window is not the cause of the ice on the river. Rather, both phenomena are results of the same cause. This kind of argument is not necessarily conclusive; yet with others it always strengthens a case.

Testimony is usually called an argument from sign. The assertion by some one that a thing occurred is not sure proof; it is only a sign that it occurred. People have said that they have seen witches, ghosts, and sea serpents, and unquestionably believed it; men generally do not accept their testimony. In a criminal case, it would be difficult to accept the testimony of both sides. Though testimony seems a strong argument, it is or it is not, according to the conditions under which it is given. One would care little for the testimony of an ignorant man in a matter that called for wisdom; he would hesitate to accept the testimony of a man who claimed he saw, but upon cross-examination could not report what he saw; and he would not think it fair to be condemned upon the testimony of his enemies. Books have been written [137] upon evidence, but three principles are all that are needed in ordinary arguments. First, the person giving testimony must be capable of observation; second, he must be able to report accurately what he has observed; third, he must have a desire to tell the exact truth.

Arguments from Example. The third large division comprises arguments from example. That is, if a truth be asserted of an individual, it can therefore be predicated of the class to which the individual belongs. For instance, if the first time a person saw a giraffe, he observed that it was eating grass, he would be justified in saying that giraffes are herbivorous. All gold is yellow, heavy, and not corroded by acid, though no one has tested it all. However, every giraffe does not have one ear brown and the other gray because the first one seen happened to be so marked; neither is all gold in the shape of ten-dollar gold pieces. Only common sense will serve to pick out essential qualities; but if essential and invariable qualities be selected, the argument from the example of an individual to all members of its class is very powerful.

Analogies resemble examples. In exposition they are used for illustration; in argument they are employed as proofs. Though two things belong to different classes of objects, they may have some qualities that are similar, and so an argument may be made from one to another. “Natural Law in the Spiritual World” is a book written to show how the physical laws hold true in the region of spirit. It is not because an enemy sowed tares in a neighbor’s field that there are wicked men in the world; nor is it because a lover of jewels will sell everything that he has to buy the pearl of greatest price that men devote everything they have to the kingdom of heaven. Analogies [138] prove nothing. They clear up relations and often help the reader to appreciate other arguments. They are valuable when the likeness is broad and easily traced. They should never be used alone.

These, then, are the principal forms of argument: deduction and induction; arguments from cause, from sign, and from example. Upon these men depend when they wish to convince of truth or error.

Selection of Material. In argument the material is selected with reference to its value as proof. Every particle of matter must be carefully tested. While a piece of material that could be omitted without loss to the explanation may sometimes find a place in exposition, such a thing must not occur in argument. As soon as a reader discovers that the writer is off the track, either he loses respect for the author’s words, or he suspects him of trying to hide the weakness of his position in a cloud of worthless and irrelevant matters. Every bit of material should advance the argument one step; it should fill its niche in the well-planned structure; it should contribute its part to the strength of the whole.

Plan called The Brief. When the material has been selected, it must be arranged. An argument is a demonstration. Each of its parts is the natural result of what has preceded, and, up to the last step, each part is the basis for the next step. As in geometry a demonstration that omits one step in its development, or, which comes to the same thing, puts the point out of its logical order, is worthless as a demonstration, so in argument not one essential step can be omitted, nor can it be misplaced. The plan in an argument may be more evident than in exposition. We are a little offended if the framework shows too plainly in exposition; but there is no offense in a well-articulated skeleton in an [139] argument. It is quite the rule that the general plan and the main divisions of the argument are announced at the very beginning. Any device that will make the relation of the parts clearer should be used. Over and over again the writer should arrange the cards with the topics until he is certain that no other order is so good. The writing is a mere trifle compared with the outline, called in argument the brief.