5. In the estimation of future ages —— will be considered the greatest President since Lincoln.
(State your premises. Have you shown that they are true?)
+181. Evidence.+—We may reach belief in the truth of a specific statement by means of deductive reasoning. Commonly, however, when dealing with an actual state or occurrence, we present other facts or circumstances that show its existence. The facts presented may be those of experience, the testimony of witnesses, the opinion of those considered as experts in the subject, or a combination of circumstances known to have existed. To be of any value as arguments, they must be true, and they must be related to the fact that we are trying to prove. These true and pertinent facts we term evidence.
Evidence may be direct or indirect. If a man sees a boy steal a bag of apples from the orchard across the way, his evidence is direct. If instead, he only sees him with an empty bag and later with a full one, the evidence will be indirect. If you testify that early in the evening you saw a tramp enter a barn which later in the evening caught fire, your testimony as regards the cause of the fire would be indirect evidence against the tramp. If you can testify that you saw sparks fall from his lighted pipe and ignite a pile of hay in the barn, the evidence which you give will be direct.
Direct evidence has more weight than indirect, but often the latter is nearly equal to the former and is sufficient to convince us. Even the direct testimony of eye-witnesses must be carefully considered. Several persons may see the same thing and yet make very different reports, even though they may all desire to tell the truth. The weight that we shall give to a person's testimony will depend upon his ability to observe and to report accurately what he has experienced, and upon his desire to tell the truth.
Notice in the following selection what facts, specific instances, and circumstances are advanced in support of the proposition. Assuming that they are true, are they pertinent to the proposition?
Certain species of these army ants which inhabit tropical America, Mr. Belt considered to be the most intelligent of all the insects of that part of the world. On one occasion he noticed a wide column of them trying to pass along a nearly perpendicular slope of crumbling earth, on which they found great difficulty in obtaining a foothold. A number succeeded in retaining their positions, and further strengthened them by laying hold of their neighbors. They then remained in this position, and allowed the column to march securely and easily over their bodies. On another occasion a column was crossing a stream of water by a very narrow branch of a tree, which only permitted them to go in single file. The ants widened the bridge by a number clinging to the sides and to each other, and this allowed the column to pass over three or four deep. These ants, having no permanent nests, carry their larvae and pupae with them when marching. The prey they capture is cut up and carried to the rear of the army to be distributed as food.
—Robert Brown: Science for All.
+Theme C.+—Present all the evidence you can either to prove or disprove one of the following propositions:—
Select some question of local interest as:— 1. The last fire in our town was of incendiary origin. 2. The football team from —— indulged in "slugging" at the last game. 3. Our heating system is inadequate. 4. It rained last night.