Sec. 1. (I) Scope of the subject.

Sec. 2. (II) Origin of quasi contracts.

Sec. 3. (III) Nature of quasi contracts: (1) Chief characteristics.

Sec. 4. (2) Quasi contracts distinguished from contracts.

Sec. 5; (3) Quasi contracts distinguished from the duty not to commit a tort.

Sec. 6. (4) Quasi contracts distinguished from equitable obligations.

Sec. 7. (IV) Essential elements of quasi contractual obligation.

Sec. 8. (1) Receipt of a benefit.

Sec. 9. (2) Retention of benefit inequitable: Classification of quasi contracts.