"And be it further enacted by the authority aforesaid, that the said Commissioners, having obtained the said accounts and estimates from the assessor of the several townships and places, shall proceed to inspect and register the same in a book, to be provided for that purpose, distinguishing the districts and townships, and entering those of each place together; and if any account and estimate be imperfect, or not sufficiently verified and established, the said Commissioners shall have power, and they, or any two of them, are hereby authorised to summon and compel any person, whose evidence they shall think necessary, to appear before them at a day and place appointed, to be summoned upon oath or affirmation, concerning any damage or injury as aforesaid; and the said Commissioners shall, upon the call and demand of the President, or Vice President of the Supreme Executive Council, deliver, or send to the Secretary of the said council, all or any of the original accounts and estimates aforesaid, and shall also deliver, or send to the said Secretary, copies of the book aforesaid, or any part or parts thereof, upon reasonable notice. And be it further enacted by the authority aforesaid, that all losses of negro or mulatto slaves and servants, who have been deluded and carried away by the enemies of the United States, and who have not been recovered or recompensed, shall be comprehended within the accounts and estimates aforesaid; and that the Commissioners and assessors of any county, which had not been invaded as aforesaid, shall nevertheless inquire after, and procure accounts and estimates of any damages suffered by the loss of such servants and slaves, as is herein before directed as to other property. "And be it further enacted by the authority aforesaid, that the charges and expenses of executing this act, as to the pay of the said Commissioners and assessors, shall be as in other cases; and that witnesses shall be rewarded for their loss of time and trouble, as witnesses summoned to appear in the courts of quarter sessions of the peace; and the said charges and expenses shall be defrayed by the commonwealth; but paid, in the first instance, out of the hands of the Treasurer of the County, for county rates, and levies upon orders drawn by the Commissioners of the proper county."