Contracts with alien enemies forbidden............................... 1747

Contracts with aliens suspended or avoided by declaration of war........ 1748

Agreements involving violation of foreign laws......................... 1749

Contracts tending to promote illegal acts.............................. 1750

Contracts to indemnify for an illegal act.............................. 1751

Contracts collaterally connected with unlawful intent or act............. 1752

Test of whether agreement is collateral. Parol evidence................. 1753

Knowledge of another's unlawful purpose.............................. 1754

Promotion of another's unlawful purpose.............................. 1755

The distinction often difficult........................................ 1756

Executory promise to furnish goods intended for unlawful purpose imposes no liability...................................................... 1757

Effect of performance, illegal when contract was made, becoming legal........ 1758

Effect of performance, legal when contract was made, becoming illegal.... 1750

Change of purpose regarding performance not unlawful in itself............ 1760

Illegal performance of legal contract.................................. 1761

Executory and executed illegal contracts.............................. 1762

Contracts and sales prohibited by statute.............................. 1763

Mala prohibita and mala in se........................................ 1764

Illustrations of prohibitory statutes................................... 1765

Further illustrations of prohibitory statutes............................ 1766

Slight violations of statutory prohibitions............................. 1767

Statutes purely for revenue.......................................... 1768

Revenue statutes may invalidate contracts............................ 1769

Statutes for the protection of the parties.............................. 1770

Contracts of corporations doing business illegally....................... 1771

Statutes expressly prohibiting recovery................................ 1772

Corporation illegally doing business is liable on its contracts and may set them up in defence............................................... 1773

Wrongful addition of "& Company" to name.......................... 1774

State power to control interstate commerce is limited................... 1775

Unconstitutional state prohibitions................................... 1776

Police power of the States.......................................... 1777

Illustrations of protected interstate commerce.......................... 1778

Where some things promised are illegal, and some legal, the latter may be enforced if consideration is legal...................................... 1779

Illegal consideration................................................ 1780

Sale of several things at separate prices............................... 1781

Partly illegal bilateral contracts...................................... 1782

Illegal and insufficient consideration distinguished...................... 1783

Notes and accounts stated........................................... 1784

Recovery of profits of an illegal transaction from a partner or agent........ 1785

Criticism of suggested distinctions between partner and agent............ 1786

Rescission of executed illegal contracts................................ 1787

Rescission allowed when illegal agreement unexecuted................... 1788

Parties not in pari delicto........................................... 1789

Where one party is a fiduciary....................................... 1790

Where one party was induced by fraud to enter into the illegal contract... 1791

Conflict of laws.................................................... 1792