_Last of all we are to speak of the evidence or testimony which is to be given for or against the prisoner at the time of his trial. And first with respect to the evidence offered for the Crown; if it shall appear that the person swearing shall gain any great and evident advantage by the event of the trial in which he swears, he shall not be admitted as a good witness against the prisoner. Thus in the case of Rhodes, tried some years ago for forging letters of attorney for transferring South Sea Stock belonging to one Mr. Heysham, the prosecutor, Mr. Heysham, was not admitted to swear himself against the prisoner because in case of conviction six thousand pounds stock must have replaced to his account. But to this, though a general rule, there are some exceptions on which the compass of this discourse will not permit us to dwell. It is also a rule that a husband or wife cannot be admitted to testify against the prisoner, but to this also there are some exceptions, as in the Lord Audley's case,[57] where he was charged with holding his lady until his servant committed a rape upon her by his command. Also in marriages contracted by force against the form of the Statute; in that case it is provided that the woman, though a wife, may be admitted as evidence, as also in some other cases which we have not room to mention._ _Persons convicted of perjury, forgery, etc., are not to be admitted as legal witnesses, but that the record of their contrition must be produced at the time the objection is made, for the Court mil take no notice of hearsay and common fame in such respect. An infidel, also, that is one who believes neither the Old nor New Testament, cannot be a witness, and some other disabilities there are which being uncommon, we shall not dwell upon here Yet it is necessary to take notice that whatever is offered as proof against the defendant, shall be heard openly before him, that he may have an opportunity of falsifying it, if he be able; and as in all cases, except high treason, no council is permitted to the prisoner except in matters of law, because every man is supposed to be capable of defending himself as to matters of fact, yet the Court is always council for the prisoner and never fails of instructing and informing him of whatever may conduce to his benefit or advantage; and if any difficult points of Law arise, council are assigned him, and are permitted to argue in his behalf with the same freedom that those do who are appointed by the Crown._