With which preface, Mrs Nickleby took her nightcap from between the leaves of a very large prayer-book where it had been folded up small, and proceeded to tie it on: talking away in her usual discursive manner, all the time.
There are no more uses of "discursive" in the book.
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It is a rambling discursive book.
He recommends working more at discursive writing rather than writing for entertainment or human interest.