The object is to
explain the topic statement or to prove its truth, and a good writer will
use that number of instances which best accomplishes his purpose.
In the following selection notice how the topic statement, set forth and
repeated in the first part of the paragraph, is illustrated in the last
part by means of several specific instances:--
Nine tenths of all that goes wrong in this world is because some one does
not mind his business. When a terrible accident occurs, the first cry is
that the means of prevention were not sufficient. Everybody declares we
must have a new patent fire escape, an automatic engine switch, or a
high-proof non-combustible sort of lamp oil. But a little investigation
will usually show that all the contrivances were on hand and in good
working order; the real trouble was that somebody didn't mind his
business; he didn't obey orders; he thought he knew a better way than the
way he was told; he said, "Just this once I'll take the risk," and in so
doing, he made other people take the risk too; and the risk was too great.
At Toronto, Canada, not long ago, a conductor, against orders, ran his
train on a certain siding, which resulted in the death of thirty or forty
people. The engineer of a mill, at Rochester, N.Y., thought the engine
would stand a higher pressure than the safety valve indicated, so he tied
a few bricks to the valve to hold it down; result--four workmen killed, a
number wounded, and a mill blown to pieces.
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