All subsequent proceedings including publication of said order shall be taken in the same manner and with like effect as though all defendants were named therein by their proper names, and as to unnamed defendants and such as are not known to be living shall be in conformity with the statutes relating to defendants who reside in another state, provided that a guardian or guardians ad litem shall be appointed in accordance with the rules and practice of the court in the case of incompetent persons, to represent all unknown or unascertained defendants, and all known defendants who are infants or incompetent, provided further that the court before which said cause is heard, on a proper showing by affidavit that one or more of the defendants did not have actual notice of said suit in time to appear and defend the same, may in its discretion, at any time, not later than three years after

23. Compiled Laws 1915, Section 12371.

the entry of the final decree, reopen said case and order a re-hearing as to the rights of such defendants or defendants who shall serve a copy of such affidavit and order and notice of all subsequent proceedings in the case on the plaintiff or his attorney and on all defendants who appeared on the original hearing or their attorneys.24