(I). Any person present in court may be required by the court to give evidence or to produce any docu'1lel.t then and there in his possession or power. (2). Where the court considers it necessary at any time to examine any person other than a party to the suit and not called as a witness by a party to the suit, it may of its own motion summon such person as a witness to give evidence or to produce any document in his possession on a day to be fixed and may examine him as a witness or require him to produce such evidence. (3). On issuing a summons under sub-art. (2), the court may, where it considers that such oerson should have been called as a witness by either party for the proper determination of the suit require the defaulting party to comply with the provisions of Art. 112 or make such order as to costs as it thinks fit.