(1) Upon any application evidence may be given by affidavit, but the court may, at the instance of either party, order the attendance for cross-examination of the deponent. (1) Such attendance shall be in court, unless the court otherwise directs. Art. 105- Matters to which affidavits shall be confined (1) Affidavits shall be confined to such facts as the deponent is able of his own knowledge to pr<?ve,except on interlocutory ap~)lications, on which statement of his belief may be admitted if the grounds thereof are stated. (1) The relief asked for on the grounds mentioned in the affidavit shall be stated in an application to which such affidavit shall be CIVIL PROCEDURE CODE 69 attached. extracts from documents, shall be paid by th.party filing the same.