21.
Where the proposal and acceptance is through letters, the contract is made

23.
In case of general offer, there is no need to communicate the acceptance if not required by the proposer. This has been held in

24.
When the agent contracts without disclosing name and existence of his principal, in such a case on knowing about the principal, the third party may file a suit against

25.
B, the proprietor of a newspaper, publishes, at A's request, a libel upon C in the paper, and A agrees to indemnify B against the consequences of the publication, and all costs and damages of the action in respect thereof. B is sued by C and has to pay damages and also incurs expenses. Decide in the light of Section 224 of the Indian Contract Act, 1872.

28.
A contract needs to be written, registered and signed by parties and witnessed