The, Commissioners may in such Case, instead of making one Assessment for the whole Town or District within the Limits of the special Act, make separate and distinct Assessments, as Occasion shall require, for every such separate and distinct District respectively, and may appoint, if they see fit. Surveyors, Collectors, and other Officers for every such District, and they shall cause separate and distinct Accounts to be kept of all Monies collected and received under any Rate in each distinct District, and of all Payments and Disbursements in respect thereof, and they shall, unless otherwise provided by the special Act, apply the Monies to be collected and received from each distinct District under any such Rate as aforesaid for the several Purposes to which the same may be lawfully applied under the Authority of this and the special Act, hut so nevertheless that each District shall, as near as may be, bear its own Expences; and in case any such Expences shall apply to or be incurred in respect of Two or more Districts, the same shall be apportioned and divided between such Districts in a fair and equitable Manner.