(5) Government letters from certain Government Departments approved by the Administrator may be franked by means of a rubber stamp, subject to the letters being initinlled by some person employed in the Department who is entitled to frank Governinent letters. _ (6) The name of the Government Department of origin when printed on an envelope shall not be regarded as a frank unless authenti- cated by the signature or initials of an authorised officer. 21. Uniawrun Converance ov Postan Packets. (1) Ne person shall convey any postal packet to be posted on board any ship. (2) The master of a ship or any person under his control shall not receive on board that ship while in any port of the Presideney, portal packets other than those despatched through the Post Office. 22. GrRarviTIns ror SEA caRRtacK. (1) The gratuities payable to owners, masters or agents of ships conveying mails, including (ransit mails, (other than ships under contract or in respeet of which a subsidy is paid or in respect of which other arrangements exist for the convey- ance of mails) shall be at the rates specified in Schedale F hereto. (2) The rates hereby authorised ave in respect of the net weights of correspondence and parcels, that is to say, the actual net weight of the postal packets or pareels where easily ascertainable, or where the net weight is not easily ascertainable the gross weight. less ten per centum of the same, shall Le deemed to be the net weigit. (3) No gratuities shall be payable in respect of empty bugs. 23. Weicit axp Dimexsioss oF Posran Articles, The limits of weight aud dimensions of postal articles shall be as preseribe:! in Schedule G hereto. 24. Pacwine or Postar Anticies. (1) The contents of every postal article shall he packed and seeurel by the sender in such 9 monner us may afford adequate protection to the contents thereof or to ther postal articles. (2) Any postal article which, im the opinion of the Postmaster does not comply with the requirements of sub-regulation (1) of this regula- tion muy be refused acceptance, or may be intercepted and detained in the course of trausmission. 25. Inevertar Excuosures iy Postai Artictes, No postal article directed to one address may contain any other article addressed to a different address and any postal article found to contam any enclosure contrary to this regulation shall be surcharge? on delivery with an amount equal to double the postage whieh woul: lave been payable upon such cuclosure if it had been transmiticd separately.