| (1) | - | by the communication of notice of revocation by the proposer to the other party; |
| (2) | - | by the lapse of the time prescribed in such proposal for its acceptance, or, if no time is so prescribed, by the lapse of a reasonable time, without communication of the acceptance; |
| (3) | - | by the failure of the acceptor to fulfil a condition precedent to acceptance; or |
| (4) | - | by the death or insanity of the proposer, if the fact of the death or insanity comes to the knowledge of the acceptor before acceptance. |