A condition is a limitation on an uncertainty, sec 545.

Limitation must be as to uncertainty, sec 546.

Contract conditioned on impossibility is void, sec 547.

While condition is still undetermined, promise is operative though suspended, sec 548.

Promises to pay in future may be conditional, sec 549.

In Roman law promises are suspensive or resolutive, sec 550.

In our law precedent or subsequent, sec 551.

Conditions precedent may be divisible, sec 552.

II. Construction

Formal expressions of condition not to overrule real intention, sec 553.

Whether a stipulation is a condition depends on intention, sec 554.

Whole contract to be considered, sec 555.

Extrinsic facts admissible to explain, sec 556.

Time of performance material, sec 557.

When acts are reciprocally dependent, party suing for non-performance must aver and prove readiness to perform, or performance, sec 558.