text:  3d _propter affectum_; for suspicion of bias or partiality: and 4th _propter delictum_; or for some crime that affects the juror's credit and renders him infamous; In treason and felony the prisoner is allowed the privilege of a limited number of _peremptory_ challenges; after which as in misdemeanours there is no limit to the number of challenges if the party shows some cause for each challenge to the court