Read it through once

A singular circumstance then arose in the case. The object in hand being to show that the prisoner went down, with some fellow-plotter untracked, in the Dover mail on that Friday night in November five years ago, and got out of the mail in the night, as a blind, at a place where he did not remain, but from which he travelled back some dozen miles or more, to a garrison and dockyard, and there collected information; a witness was called to identify him as having been at the precise time required, in the coffee-room of an hotel in that garrison-and-dockyard town, waiting for another person. The prisoner’s counsel was cross-examining this witness with no result, except that he had never seen the prisoner on any other occasion, when the wigged gentleman who had all this time been looking at the ceiling of the court, wrote a word or two on a little piece of paper, screwed it up, and tossed it to him. Opening this piece of paper in the next pause, the counsel looked with great attention and curiosity at the prisoner.