This book deals with the nature of international organizations and the tension between their legal nature and the system of classic, state-based, international law. This tension is important in theory and practice, particularly when organizations are brought under the rule of international law and thus have to be designated as legal subjects. The position is complicated by what the author terms 'the institutional veil, ' comparable to the corporate veil found in corporate law. The book focuses on the law of treaties - a pre-eminently 'horizontal' branch of international law - bringing out the...