List of objections in recriminatory case

The respondents in a petition complaining of an undue return and claiming the seat for some other person may lead evidence to prove that the election of such other person was undue and in such case such respondent shall, six days before the day appointed for trial, deliver to the Registrar, and at also the address, if any, given by the petitioner, a list of the objections to the election upon which he intends to rely, and the Registrar shall allow inspection of office copies of such list to all parties concerned and no evidence shall be given by a respondent of any objection to the election not specified in the list, except by leave of the judge, upon such terms as to amendments of the list, postponement of the inquiry, and payment of costs, as may be ordered.