Whereas the commissioners and chief governors of His Majesties revenue (being the persons and officers duly authorized by themselves, substitutes, agents or servants for the receiving, collecting and answering the duty arising by hearths, firing-places, stoves and publick ovens and kilns) have desired that all our due care may be taken, that no certificates be unduly granted by the justices of the peace unto such persons who by the acts for setting the said duty on His Majesty are uncapable thereof ..