The said Commissioners shall make a report of their proceedings, under the foregoing sections of this act, containing a full statement and description of the plan adopted by them an estimate of the expense thereof, together with an estimate of the ;

probable amount of revenue to accrue to the city, upon the completion of the work with ;

the reasons and calculations upon which their opinions and the said estimates may be founded and all such other information, connected with the object of their appointment, :

as they may deem important.

6 Such report shall be made and presented to the Common Council, by the Commissioners, together with all such conditional contracts as may have been made by them by virtue of this act, on or before the first day of January, which will be in the year one thousand eight hundred and thirty-six. 7. In case the plan so adopted by the Commissioners, shall be approved of by the Common Council, they shall appoint a poll to be open on the days upon which the next annual election for charter officers is by law appointed to be held and the inspectors of ;

said election shall provide a ballot box, with suitable lock and key, and the electors shall express their assent or refusal to allow the Common Council to proceed in raising the money necessary to construct the works as aforesaid, by depositing their ballots in the box provided for that purpose in their respective wards. And those electors who are in favor of granting the necessary power to the Common Council, shall each deposite a ballot containing the word "yes," written or printed thereon and those who are opposed, shall each deposite ;