Chapter XVI: Section 5: Whenever a county shall contain forty thousand inhabitants

it shall constitute a separate judicial district, and shall elect
one judge learned in the law; and the General Assembly shall provide
for additional judges, as the business of the said districts may
require. Counties containing a population less than is sufficient to
constitute separate districts shall be formed into convenient single
districts, or, if necessary, may be attached to contiguous districts
as the General Assembly may provide. The office of associate judge,
not learned in the law, is abolished in counties forming separate
districts; but the several associate judges in office when this
Constitution shall be adopted shall serve for their unexpired terms.

Common Pleas Courts in Philadelphia and Allegheny Counties.