The Indian Contract Act, 1872
8. Acceptance by performing conditions, or receiving consideration .
Performance of the conditions of proposal, for the acceptance of any consideration for a reciprocal promise which may be offered with a proposal, is an acceptance of the proposal.
Performance by act: Interference of acceptance
The defendant company advertised that they would pay pound 1,000 to any person who used their carbolic smoke ball for a certain time any yet contracted influenza. The plaintiff purchased the medicine, used it for the stated time but contracted the disease. It was held that the contract was accepted by being acted upon, that the defendant had not stipulated for any communication of acceptance and therefore the plaintiff was entitled to recover the amount; Carlill v. Carbolic Smoke Ball Co., (1893) 1 QBD 256.