§15-73.

§15-73.
   
   A proposal is revoked:
   
   1. By the communication of notice of revocation by the proposer to the
   other party, before his acceptance has been communicated to the
   former.
   
   2. By the lapse of the time prescribed in such proposal for its
   acceptance, or if no time is so prescribed the lapse of a reasonable
   time without communication of the acceptance.
   
   3. By the failure of the acceptor to fulfill a condition precedent to
   acceptance; or,
   
   4. By the death or insanity of the proposer.