A copy of the order shall be published once in each week for 3 weeks in some newspaper circulated in the county, to be designated by the court, the first publication to be not less than 3 weeks before the hearing. A copy of the order shall also be served on each person named in the petition interested in the land described therein in the manner provided in section 54. The publication shall constitute service of the order upon all non-residents of the county and upon all persons who are absent from the county or are unknown or are evading service or who for any other reason cannot be found. Proof of publication and service may be made by affidavit of any person having knowledge of the facts. The proof shall be filed with the court on or before the day of hearing and thereupon the court shall have jurisdiction of the subject matter involved in the proceedings and of the parties interested therein. Service of the order in any mode herein prescribed shall be sufficient notice of the proceeding to bind the parties in interest named therein and the property represented by them as described in the petition.