The DEAN OF FACULTY--Before this witness is called I rise to state to the Court an objection against his admissibility. This witness is alleged to have been guilty of the same crime of which the pannels at the bar now stand accused, and therefore the objection of his being a _socius criminis_ might apply to him. But although by our former law the objection of a witness being _socius criminis_ might render him inadmissible, yet I have no occasion, nor is it my intention, to insist on the present objection in that view, for I freely own that the practice of this Court has for some time past, and with great propriety, I think, over-ruled that objection. But, my Lords, I contend that this witness is inadmissible from the particular circumstances attending his case. For, according to the information which I have received, when this witness was apprehended and committed to prison, in the month of March last, to stand trial for this crime, he never charged Mr. Brodie as having been in any measure accessory thereto. On Ainslie’s first examination he positively affirmed that Mr. Brodie had no sort of accession to the crime of which he is now accused, or was concerned in any other bad action whatever to his knowledge, unless playing at cards and dice should be reckoned such; and in the different declarations which he made before the Sheriff he still persisted in denying that my client had any concern in this robbery. But after Mr. Brodie was apprehended and brought from Holland Ainslie was again brought before the Sheriff, when he was informed that either he himself must be hanged or he must accuse Mr. Brodie. Further, I am now instructed to say that when this witness was carried before the Sheriff his life was offered to him on his becoming King’s evidence against Mr. Brodie, and accusing him of having been concerned in this robbery, and that, even notwithstanding this offer, he persisted in denying that Mr. Brodie was guilty of this crime, until John Brown _alias_ Humphry Moore, another of the witnesses cited, and alleged also to have been a _socius criminis_, was allowed to see and converse with him in prison, when at length he came into the measures proposed. I mean to say nothing against the conduct of the Sheriff, which may have been very proper--with the motives which may have influenced a public officer to a particular line of conduct I have nothing to do--but I state it as an insuperable bar to the admissibility of this witness, that hopes were suggested to him of saving his own life by criminating my client. And I offer to prove, by the evidence of the Sheriff of Edinburgh himself, that a bargain of this nature was made with Ainslie, and that it was not till then he was prevailed upon to say that Mr. Brodie had any concern in this crime. No man could withstand such a temptation, and it is impossible that the Court can receive the testimony of a witness in such circumstances.