by inference

References in classic literature ?
In Scotland, consent makes marriage," he said; "and consent may be proved by inference.
For though other species of whales find their food above water, and may be seen by man in the act of feeding, the spermaceti whale obtains his whole food in unknown zones below the surface; and only by inference is it that any one can tell of what, precisely, that food consists.
She seems to have heard both of your marriage and your absence; but I gather, by inference, that she does not actually know where you and Mimi are, or of your return.
These results provide strong support for the hypothesis that the interestingness of a story is affected by inference generation.
Many of those courts, however, will allow the link to be established by inferences drawn from the affiant's training and experience.