The rates of postage for the conveyance of postal articles throughout the entire extent of the Union, including their delivery at the residence of the addressees in the countries of the Union where a delivery service is or shall be organized, are fixed as follows:
1st. For letters, 25 centimes in case of prepayment, and double that amount in the contrary case, for each letter and for every weight of 15 grammes or fraction of 15 grammes;
2d. For post-cards, 10 centimes per card;
3d. For printed matter of every kind, commercial papers, and samples of merchandise, 5 centimes for each article or packet bearing a particular address; and for every weight of 50 grammes or fraction of 50 grammes, pro-vided that such article or packet does not contain any letter or manuscript note having the character of an actual and personal correspondence, and that it be made up in such a manner as to admit of its being easily examined.
The charge on commercial papers cannot be less than 25 centimes per packet, and the charge on samples cannot be less than 10 centimes per packet.
In addition to the rates and minima fixed by the preceding paragraphs, there may be levied:
1st. For every article subjected to the sea transit rates of 15 francs per kilogramme of letters or post-cards and 1 franc per kilogramme of other articles, an additional charge, which may not exceed 25 centimes per single rate for letters, 5 centimes per post-card, and 5 centimes per 50 grammes or fraction of 50 grammes for other articles. As a temporary arrangement, there may be levied an additional charge up to 10 centimes per single rate for the letters subjected to the transit rate of 5 francs per kilogramme.
2d. For every article conveyed by services maintained by Administrations foreign to the Union, or conveyed by extraordinary services in the Union giving rise to special expenses, an additional charge in proportion to· these expenses.
In case of insufficient prepayment, articles of correspondence of all kinds are liable to a charge equal to double the amount of the deficiency, to be paid by the addressees.
Circulation shall not be given-
1st. To articles other than letters which are not prepaid at least partly, or which do not fulfill the conditions required above in order to enjoy the reduced rate;
2d. To articles of a nature likely to soil or injure the correspondence;
3d. To packets of samples of merchandise which have a salable value, or which exceed 250 grammes in weight, or measure more than 20 centimeters in length, 10 in breadth, and 5 in depth.
4th. Lastly, to packets of commercial papers and printed matter of all kinds, the weight of which exceeds 2 kilogrammes.