_d._ The selection of details essential to the climax in accordance
with the principle of unity.
_e._ The arrangement of these details in a coherent order.
_f._ The skillful introduction of minor details which will assist in
the appreciation of the point.
_g._ The introduction of all necessary description and explanation.
_h._ That additional effectiveness which comes from
(1) Proper choice of words.
(2) Suitable comparisons and figures.
(3) Variety of sentence structure.
_i._ A brief conclusion.
X. EXPOSITION
+152. Purpose of Exposition.+--It is the purpose of exposition to make
clear to others that which we ourselves understand. Its primary object is
to give information. Herein lies one of the chief differences between the
two forms of discourse just studied and the one that we are about to
study. The primary object of most description and narration is to please,
while that of exposition is to inform. Exposition answers such questions
as how? why? what does it mean? what is it used for? and by these answers
attempts to satisfy demands for knowledge.
In the following selections notice that the first tells us _how_ to
burnish a photograph; the second, _how_ to split a sheet of paper:--
1. When the prints are almost dry they can be burnished. The burnishing
iron should be heated and kept hot during the burnishing, about the same
heat as a flatiron in ironing clothes.
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