All 4 Uses

illustrate
in
A Passage to India
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"McBryde has an illustrated bird book," he said dejectedly.†
Chpt 8 *

illustrated = (verb) drew pictures to accompany OR (adjective) accompanied by pictures
To illustrate my meaning, let me take the case in point as an example.
Chpt 19

illustrate = help make clear
And in order to illustrate the strategy, they produced a plan of the Marabar Hills, showing the route that the party had taken, and the "Tank of the Dagger" where they had camped.
Chpt 24 *
McBryde's remark, "If you leave the line, you leave a gap in the line," was being illustrated.†
Chpt 19

Definitions:

(1) (illustrate as in: as illustrated by this example)
to help make clear -- typically by example
(2) (illustrate as in: an illustrated children's book)
to draw pictures (or provide photographs) to accompany a book or other writing
(3) (meaning too rare to warrant focus)