The document discusses different situations that can result in the discharge of a contract by supervening impossibility: 1) Destruction of the subject matter of the contract, a change in law or authority, or an outbreak of war can make performance of a contract impossible and discharge the parties. 2) If a contract depends on the personal skill or qualification of a party, and that party dies or becomes incapacitated, the contract will be discharged. 3) A change in law after a contract is formed, or actions by the government under new authority, can also make performance impossible and discharge the parties if the contract.