ůmade fast to the dwarf wall which skirted it: and here and there an oar or coil of rope: appeared, at first, to indicate that the inhabitants of these miserable cottages pursued some avocation on the river; but a glance at the shattered and useless condition of the articles thus displayed, would have led a passer-by, without much difficulty, to the conjecture that they were disposed there, rather for the preservation of appearances, than with any view to their being actually employed.
There are no more uses of "conjecture" in the book.
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She dismissed it as mere conjecture.
It is important to distinguish between conjecture and fact.