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 * b) to articles of the same categories which exceed the limits of weight and size fixed by Article 5;
 * c) to samples of merchandise which have a salable value.

2.—If any of the articles mentioned in the preceding paragraph be given circulation, they should be returned to the office of origin, and, if possible, be delivered to the sender.

3.—It is forbidden:

1st to send by mail:

a) samples and other articles which, from their nature, may prove dangerous to the postal employés, soil or injure the correspondence;

b) explosive, inflammable or dangerous substances; animals and insects, living or dead, excepting the cases provided for in the Regulations of detail.

2nd to insert in ordinary or registered articles placed in the mails:

a) current coin;

b) articles liable to customs duty;

c) gold or silver bullion, precious stones, jewelry, and other precious articles, but only in case their insertion or transmission is prohibited by the legislation of the countries concerned.

4.—Articles coming under the prohibition of paragraph 3 preceding which have been forwarded erroneously, should be returned to the office of origin, except in cases where the Administration of the country of destination is authorized by its legislation or by its domestic regulations to dispose of them otherwise.

5.—There is, moreover, reserved to the Government of every country of the Union the right to refuse to convey over its territory, or to deliver, as well articles liable to the reduced rate in regard to which the laws, ordinances or decrees which regulate the conditions of their publication or circulation in that country have not been complied with, as correspondence of every kind which bears ostensibly inscriptions, designs, etc. forbidden by the legal enactments or regulations in force in the same country.

1.—The Offices of the Union which have relations with countries outside the Union, admit all the other Offices of the Union, to take advantage of such relations for the exchange of postal articles with the said countries.

2.—The postal articles exchanged in open-mail between a country of the Union and a country foreign to the Union, through the intermediary of another country of the Union, is treated, as regards the conveyance beyond the limits of the Union, in conformity with the Conventions, Arrangements, or special provisions governing the postal relations between the latter country and the country foreign to the Union.