Subscriptions as to educational and charitable objects can ordinarily be accepted only by performing the conditions stipulated in the offer; but the performance of such conditions within a proper time is a sufficient acceptance, even if not specifically brought to the notice of the offeror.1 An offer to pay a certain amount of money when a railroad should be built, may be accepted by building the railroad within a proper time and bringing an action to recover such money.2 Notice of acceptance of such subscription by such railway is not necessary.3