art and part, n. Scots law. Participation in or encouragement of a crime; criminal guilt by assisting, advising, or participating in the crime. Cf. OPE ET CONSILIO .
“Scots law never distinguished between degrees of participation in a crime, between what English law distinguished as accession before the fact, concomitant accession, and accession after the fact. In treason all participants were treated as principal offenders and indictments in other cases charged the accused as ‘actor or art and part’. The Criminal Procedure (Scotland) Act 1887 made this an unnecessary but implied charge in all indictments.” 6 David M. Walker, A Legal History of Scotland 397 (2001).