CHAPTER IV
- Promisor not bound to perform, unless reciprocal promisee ready and willing to perform.
- Order of performance of reciprocal promises.
- Liability of party preventing event on which the contract is to take effect.
- Effect of default as to that promise which should be first performed, in contract consisting of reciprocal promises.
- Effect of failure to perform at fixed time, in contract in which time is essential. Effect of such failure when time is not essential. Effect of acceptance of performance at time other than that agreed upon.
- Agreement to do impossible act. Contract to do an act afterwards becoming impossible or unlawful. Compensation for loss through non-performance of act known to be impossible or unlawful.
- Reciprocal promise to do things legal, and also other things illegal.
- Alternative promise, one branch being illegal.