Abrogation of Treaties as the Result of Changes in Circumstances — Interpretation by Reference to the Context — Two Paragraphs of One Article — Treaties Imposing Burdens upon Third States — Treaties in Favour of Third Parties — Partial Impossibility of Execution of Treaties — Clauses of the Arbitration Agreement — Impossibility of Applying One of the Clauses — Whether Invalidating the Whole Agreement — Re-Adaptation of Treaties to New Conditions — Opinion, as Distinguished from Judgment, of the Permanent Court of International Justice — Oral Declarations in the Course of Judicial Proceedings — Binding Force — Execution of the Judgment.