These are the surviving affidavits of the Court of Common Pleas, retained because they affected title to property or were of material interest, together with related instruments filed with them.
Some of these types of instruments, such as declarations in ejectment and warrants of attorney to confess judgment, are also found in series of their own. There is also some miscellaneous correspondence. Many affidavits were sworn in the country before commissioners.
Among subjects about which they provide information are arbitration, wills, marriages, trade and commerce and local affairs, the topography of particular landscapes, local boundaries, town and parish customs, the work of officers of the court, especially the prothonotaries and filazers, and of town and country attorneys, the working of the postal service and the costs of travel, and even the weather at particular times and places.