This section is from the book "The Law Of Contracts", by William Herbert Page. Also available from Amazon: Commercial Contracts: A Practical Guide to Deals, Contracts, Agreements and Promises.
VI. APPARENT AND ILLUSORY CONSIDERATIONS
Sec. 565. The doctrine of mutuality.
Sec. 566. Mutual promises.
Sec. 567. Unenforceable promise as consideration.
Sec. 573. Effect of substantial interval between notice and termination of contract. Sec. 574. Contract terminable on event other than will of party.
Sec. 575. Contract to be performed at option of adversary party - Equivalent to offer.
Sec. 576. Equivalent to preliminary negotiation.
Sec. 577. Performance mandatory - Details in discretion of one party.
Sec. 578. Performance at option of one party - Independent consideration.
Sec. 579. Contract to deal with adversary party exclusively - Promise held without consideration.
Sec. 580. Contract to deal with adversary party exclusively - Contract held to be upon consideration.
Sec. 584. Contract requiring test.
Sec. 585. Performance of duty imposed by law.
Sec. 588. Contracts between parties primarily and secondarily liable for legal duty. Sec. 589. Performance of pre-existing contract between the same parties - Held not to constitute consideration. Sec. 590. Held to constitute consideration. Sec. 591. Unforeseen difficulties in performance held to constitute consideration.
Sec. 592. Presence of additional consideration.
Sec. 505. Payment of all or part of liquidated undisputed debt due as consideration for new promise.
Sec. 590. Change as to person or security.
Sec. 600. Change in medium of payment - Payment by check.
Sec. 603. Gift or sale of debt by creditor to debtor.
Sec. 604. Written receipt in full.
Sec. 605. Payment of interest due.
Sec. 607. Change in time of paying interest.
Sec. 608. Payment of usurious interest.
Sec. 609. Performance of joint liability.
Sec. 610. Reciprocal release of contractual rights.
Sec. 611. Performance with modification.
VII. COMPROMISES Sec. 612. Compromise of disputed claim - What constitutes dispute. Sec. 613. Dispute as to fact or law. Sec. 614. Sufficiency of genuine dispute. Sec. 615. Necessity of valid claim. Sec. 616. Necessity of good faith.
Sec. 620. Absence of reasonable ground equivalent to absence of good faith. Sec. 621. Effect of pendency of action. Sec. 622. Specific examples of compromises. Sec. 623. Attitude of courts toward compromises.
VIII. PAST CONSIDERATION AND MORAL OBLIGATION Sec. 624. History of doctrine of past consideration. Sec. 625. Past consideration - Nature and effect. Sec. 626. Illustrations of past consideration. Sec. 627. Past services.
Sec. 631. Promise to perform prior duty and to perform in excess thereof. Sec. 632. Moral obligation - Pror legal liability.
IX. ADEQUACY Sec. 635. Adequacy of consideration - At law - Value not fixed in money.
Sec. 637. Adequacy of consideration in equity.
Sec. 639. What constitutes inadequacy of consideration.
Sec. 640. Adequacy as of date of transaction.
Sec. 641. Unconscionable contracts in equity - Nature.
Sec. 642. Unconscionable contracts in equity - Effect.
XII. PRESUMPTION OF CONSIDERATION Sec. 650. Presumption of consideration - Contract under seal. Sec. 651. Presumption of consideration - Negotiable contract. Sec. 652. Presumption of consideration - Written non-negotiable instruments. Sec. 653. Statutory provisions.
Sec. 654. Presumption of consideration - Oral contract. Sec. 655. Conclusive or prima facie character of presumption.