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Rule 4. Variety must have its charm even in Lines,
and though simplicity is pleasing, contrast, and some-
thing that gives distinctness, by a kind of opposition,
should be contrived.

Rule 5. Degrees of strength may be made to give the
effect of three tints by an artful management of Lines,
and should be attempted.

Rule 6. The degrees of distance to be carefully ex-
pressed by their lightness and strength, and also by their
being imperfectly, or well defined.

Rule 7. A part, requiring particularly to be distin-
guished from the rest, may receive an additional effect
of shadow from connected Oblique Lines passing over it
by a quick movement of the pencil; but this must oc-
casion no disturbance in the scale of strength, and be
very seldom used.

Landscape.

The Lines should be so adapted as to produce effect
of light and shade through every scene, and with so much
effect, as even to present varieties in the weather, as of
a bright, or misty day: the former by a strong oppo-
sition of broad and faint Lines; the latter by softness
and equality.
 
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