Development by Comparison.+--In Section 29 we found that comparison,
whether literal or figurative, aided us in forming mental images of
objects. In a similar way events and general principles may be explained
by making suitable comparisons. We are continually comparing one thing
with another. Every idea tends to recall other ideas that are similar to
it or in contrast with it. When an unfamiliar idea is presented to us we
at once seek to associate it with similar ideas already known to us. A
writer, therefore, will make his meaning clear by furnishing, the desired
comparisons. If these are familiar to us, they enable us to understand
the new ideas presented. Even when both ideas in the comparison are
unfamiliar, each may gain in clearness by comparison with the other.
In comparing two objects, events, or principles we may point out that they
are _not_ alike in certain respects. A comparison that thus emphasizes
differences, rather than likenesses, becomes a contrast. The contrast may
be given in a single sentence or in a single paragraph, but often a
paragraph or more may be required for each of the two ideas contrasted.
EXERCISE
Notice how comparisons and contrasts are used in the following
paragraphs:--
1. Niagara is the largest cataract in the world, while Yosemite is the
highest; it is the volume that impresses you at Niagara, and it is the
height of Yosemite and the grand surroundings that make its beauty.
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