The examinations of the prisoners before the magistrates of Edinburgh served only to bring to light fresh atrocities and to excite fresh horror; and eventually the whole of the prisoners were committed for trial, the evidence being clear and conclusive as to the implication of the men, although that which affected the women left great doubts as to the possibility of their conviction being secured. During the period which elapsed subsequently to their committal, and preparatory to their trial, Hare, with a degree of villany excelling that of his fellow in guilt, offered to make disclosures upon the subject of the system which had been carried on, upon condition of his own indemnification from punishment, and that of his wife. Mrs. Laird, it had been discovered, was the least guilty of the whole party, and so far as her discharge was concerned but little difficulty was experienced; but upon the question of the other terms desired by Hare to be imposed in reference to his own case, considerable doubt was entertained. Long and frequent consultations were held by the magistrates upon the subject, in which the probabilities of the conviction of these associates in villany were most anxiously weighed; and it was at length determined that, for the sake of that justice which imperatively demanded the most satisfactory and complete evidence of the guilt of one at least of the gang, the offer should be accepted. The prisoner then made a statement to the officers of the jail, which was reduced to writing, but which, from causes too obvious to need repetition here, was not published in full. That portion of it which immediately affected the case of Burke and Mrs. M'Dougal came out upon the trial; but many particulars with regard to the system which had been carried on were most properly concealed from the public knowledge. On the 23rd December in the same year, the two prisoners, William Burke and Helen M'Dougal, were put upon their trial before the High Court of Justiciary at Edinburgh. The indictment charged against them several murders, founded upon the communications made by Hare; but after much discussion on the part of the counsel for the crown, and on behalf of the prisoners, it was determined that that part only of the indictment which alleged them to have murdered Mary Campbell should be proceeded with, inasmuch as that the disclosure of any of the particulars of one murder in the course of a trial for another would materially prejudice the minds of the jury against the persons charged. The murder of Mrs. Campbell was alleged to have been committed by suffocation. The preliminary witnesses produced a plan of the house of the prisoners in Tanner's-close, and proved the identity of the remains found at the house of Dr. Knox.