the international relations of which it is responsible. Such a declaration shall take effect when the Convention enters into force for the State concerned.
2. At any time thereafter any such extension shall be made by notifica- tion addressed to the Secretary-General of the United Nations and shall take effect as from the ninetieth day after the day of receipt by the Secretary- General of the United Nations of this notification, or as from the date of entry into force of the Convention for the State concerned, whichever is the later.
3. With respect to those territories to which this Convention is not extended at the time of signature, ratification or accession, each State con- cerned shall consider the possibility of taking the necessary steps in order to extend the application of this Convention to such territories, subject, where necessary for constitutional reasons, to the consent of the Governments of such territories.
ARTICLE 41
Federal Clause
In the case of a Federal or non-unitary State, the following provisions shall apply:
(a) With respect to those articles of this Convention that come within the legislative jurisdiction of the federal legislative authority, the obliga- tions of the Federal Government shall to this extent be the same as those of Parties which are not Federal States;
(b) With respect to those articles of this Convention that come within the legislative jurisdiction of constituent States, provinces or cantons which are not, under the constitutional system of the Federation, bound to take legislative action, the Federal Government shall bring such articles with a favourable recommendation to the notice of the appropriate authorities of States, provinces or cantons at the earliest possible
moment.
(c) A Federal State Party to this Convention shall, at the request of any other Contracting State transmitted through the Secretary-General of the United Nations, supply a statement of the law and practice of the Federation and its constituent units in regard to any particular provision of the Convention showing the extent to which effect has been given to that provision by legislative or other action.
ARTICLE 42
Reservations
1. At the time of signature, ratification or accession, any State may make reservations to articles of the Convention other than to articles 1, 3, 4, 16 (1), 33, 36-46 inclusive.
2. Any State making a reservation in accordance with paragraph 1 of this article may at any time withdraw the reservation by a communication to that effect addressed to the Secretary-General of the United Nations.
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