International organization — European Coal and Steel Community — Decisions of High Authority — Appeals against — Admissibility of — Allegation of detournement de pouvoir — Relevance to admissibllity — Perlods of limitation — Decision amending earlier decision — Whether time runs again from second decision.

Disputes — International courts — Court of European Coal and Steel Community — Pleadings — Introduction of new head of action in reply — Distinction between new head of action and new argument — Rules of Procedure, Article 38 (1).

International organization — European Goal and Steel Community — Decisions of High Authority — Détournement de pouvoir — Relevance of aims of High Authority as published in Memoranda — Relevance of lack of foresight on part of Authority — Relevance of motive of avoiding administrative difficulties — Uniform subsidy tax — Whether constituting discrimination within Article 4 of Treaty establishing Community.