Treaties — Power to conclude — European Economic Community — Treaty-making powers of the Community and its Member States — Community possessing power to adopt internal legislation on subject — Whether possessing parallel power to conclude international agreements — Transport — Whether Member States retaining power to act — Exclusive nature of Community powers — Certain Member States party to older treaties on same subject — New agreement to amend older treaties — Whether legitimate for Member States to participate for purpose of amending older treaties — Mixed agreements — Establishment of international organization — Participation in organization by Community

Rivers — International management — Rhine — Moselle — Revised Convention for the Navigation of the Rhine, 1868 — Convention for the Canalization of the Moselle, 1956 — Attempts to revise — Creation of European Laying-up Fund for Inland Waterway Vessels — Participation by Member States of the European Economic Community — Whether permissible — Whether compatible with Community law

International organizations — Establishment and membership — European Laying-up Fund for Inland Waterway Vessels — Participation by European Economic Community and Member States — The law of the European Economic Community