International Law — Sources of — Article 38 of the Statute of the Permanent Court — Rules of Equity — Conventional and Customary International Law.

State Responsibility — In General — Breach of Treaty Obligations — Requirement of Evidence of Damage.

Interpretation — Various Rules of — Equality of Obligations — Interpretation by Reference to the Object of the Treaty and its Practical Results.

Treaties — Interpretation of — In General — Equality of Obligations — Presumption against Inequality — Interpretation of the Treaty as a Whole by Reference to its Object — Dutch-Belgian Treaty of May 12, 1863, Concerning the Régime of the Waterworks of the Meuse — Treaty Provisions and Customary International Law.