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. Care must be taken to keep the
polished surface of the burnisher bright and clean. When the iron is hot
enough the prints should be rubbed with a glace polish, which is sold for
this purpose, and is applied with a small wad of flannel. Then the prints
should be passed through the burnisher two or three times, the burnisher
being so adjusted that the pressure on the prints is rather light; the
degree of pressure will be quickly learned by experience, more pressure
being required if the prints have been allowed to become dry before being
polished. White castile soap will do very well as a lubricator for the
prints before burnishing, and is applied in the same manner as above.

--_The Amateur Photographer's Handbook_.

2. Paper can be split into two or even three parts, however thin the
sheet. It may be convenient to know how to do this sometimes; as, for
instance, when one wishes to paste in a scrapbook an article printed on
both sides of the paper.

Get a piece of plate glass and place it on a sheet of paper. Then let the
paper be thoroughly soaked. With care and a little ski