Assent of party charged necessary to bind him, sec 809.

Only parties to a contract can be sued on it, sec 810.

Illustrated in case of agents signing in their own names, sec 810 a.

Exceptions of undisclosed principal, and of companies bound by promoters, sec 811.

Action of tort may be maintained for abuse of contractual relations, sec 812.

By novation new debtor may be introduced, sec 813.