31. "Contingent contract" defined

32. Enforcement of contracts contingent on an event happening

33. Enforcement of contracts contingent on an event not happening

34. When event on which contract is contingent to be deemed impossible, if it is the future conduct of a living person

35. When contracts become void which are contingent on happening of specified event within fixed time

When contracts may be enforced which are contingent on specified event not happening within fixed time

36. Agreement contingent on impossible events void