594 Service of notice of a call. Forms 44, 48, 50 and 51 Enforcement of call Ferms 52, 53, and 54, Proof o debt. Verification of prool. Centents of preof, Ferm 54. Statement of security, TPreof before whom sworn. Costs of proof, iscount, Periodical payments. Ch. 31. No. 1.] Compantes. 71. When a call has been made by the Liquidator in a winding up by the Court, a copy of the resolution of the Committee of Inspection or order of the Court (if any), as the case may be, shall forthwith after the call has been made be served upon each of the contributories included in such call, together with a notice from the Liquidator specifying the amount or balance due from such contributory in respect of such call, but such resolution or order need not be advertised unless for any special reason the Court so directs. 72. The payment of the amount due from each contnbutory on a call may be enforced by order of the Court, to be made in Chambers on summons by the Liquidator. Proofs. 73. In a winding up by the Court every creditor shall subject as hereinafter provided prove his debt, unless the Judge in any particular winding up shall give directions that any creditors or class of creditors shall be admitted without proof. 74. A debt may be proved in any winding up by delivering or sending through the post an affidavit verifying the debt. In a winding up by the Court the affidavit shall be so sent to the Official Receiver or if a Liquidator has been appointed, to the Liquidator; and in any other winding up the affidavit may be so sent to the Liquidator. 75. An affidavit proving a debt may be made by the creditor himself or by some person authorised by or on behalf of the creditor. If made by a person so authorised, it shall state his authority and means of knowledge. 76. An affidavit proving a debt shall contain or refer to a statement of account showing the particulars of the debt, and shall specify the vouchers, if any, by which the same can be substantiated. The Official Receiver or Liquidator to whom the proof is sent may at any time call for the production of the vouchers. 77, An affidavit proving a debt shall state whether the creditor is or is not a secured creditor. 78. An affidavit proving a debt may in a winding up by the Court be sworn before the Official Receiver, or Assistant Official Receiver. 79. A creditor shall bear the cost of proving his debt unless the Court otherwise orders. 80. A creditor proving his debt shall deduct therefrom (a) any discount which he may have agreed to allow for payment in cash in excess of five per centum on the net amount of his claim and (8) all trade discounts. 81. When any rent or other payment falls due at stated periods, and the order or resolution to wind up is made at any time other than one of those periods, the persons entitled to the rent or payment may prove for a proportionate part thereof up to the date of the winding up order or resolution as if the rent or payment grew due from day to day: Provided that where the Liquidator remains in occupation of premises