An act for the better regulation and government of the pilots conducting ships and vessels into and out of the port of Boston, in the county of Linclon; and for affixing and setting down mooring-posts upon the banks or high marshes within or adjoining to the haven and harbour of the said port; and for affixing and laying down bridges over the creeks upon the high marshes within or adjoining to the said haven and harbour; and for preventing mischiefs by fire in the said haven and harbour.