4. It shall be open for accession by the States referred to in paragraph 2 of this article. Accession shall be effected by the deposit of an instrument of accession with the Secretary-General of the United Nations. Article 36. - Territorial application clause 1. Any State may, at the time of signature, ratification or accession, declare that this Convention shall extend to all or any of the territories for 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 notification 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 concerned 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 37. - 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 obligations 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 75