Melville Fuller,
Duncan v. McCall — Opinion of the Court
“ When once it became the settled construction of the constitution of Illinois that no act can be deemed a valid law unless, by the journals of the legislature, it appears to have been regularly passed by both houses, it became the duty of the courts to take judicial notice of the journal entries in that regard. The courts of Illinois may decline to take that trouble, unless parties bring the matter to their attention; but, on general principles, the question as to the existence of a law is a judicial one, and must be so regarded by the courts of the United States. ”
