559. Doctrine of public policy.

560. Acquiescence and waiver and effect upon brokers' rights.

561. Advertising and advertisements.

562. Accord and satisfaction.

563. Breach of contract.

564. Correspondence.

565. Advancements.

566. The borrower.

567. Acceptances.

568. Conformity.

569. Costs.

570. Conditions precedent to right to commissions.