497. Constitutional Restrictions [545]
498. Mutual Consent of the Contracting Parties [546]
499. Freedom of Action of Consenting Representatives [547]
500. Delusion and Error in Contracting Parties [547]
III. Objects of Treaties
501. Objects in general of Treaties [548]
502. Obligations of Contracting Parties only can be Object [548]
503. An Obligation inconsistent with other Obligations cannot be an Object [549]
504. Object must be physically possible [549]
505. Immoral Obligations [549]