Section 4

Section 4. And be it further enacted by the authority aforesaid, That it shall be lawful for the mayor, aldermen, and citizens of Philadelphia aforesaid, to pass ordinances, prohibiting the construction within the said city, or any parts thereof, of all framed or brick-paned or other buildings, the walls whereof are not wholly composed of incombustible materials, determining the thicknesses of which walls of buildings of different dimensions and character shall hereafter be made in the said city, and in making all such other legal provisions as they shall think expedient for preventing the extension of injuries from fire, in the said city, and to declare all buildings, the walls whereof are not wholly composed of incombustible materials, to be nuisances.