Section 189 in The Indian Contract Act, 1872
Title: Agent's authority in an emergency.
An agent has authority, in an emergency, to do all such acts for the purpose of protecting his principal from loss as would be done by a person of ordinary prudence, in his own case, under similar circumstances.
(a) An agent for sale may have goods repaired if it be necessary.
(b) A consigns provisions to B at Calcutta, with directions to send them immediately to C, at Cuttack. B may sell the provisions at Calcutta, if they will not bear the journey to Cuttack without spoiling
Title: When agent cannot delegate.
An agent cannot lawfully employ another to perform acts which he has expressly or impliedly undertaken to perform personally, unless by the ordinary custom of trade a sub-agent may, or, from the nature of the agency, a sub-agent must, be employed.
Title: "Sub-agent" defined
A "sub-agent" is a person employed by, and acting under the control of, the original agent in the business of the agency.
Title: Representation of principal by sub-agent properly appointed.
Where a sub-agent is properly appointed, the principal is, so far as regards third persons, represented by the sub-agent, and is bound by and responsible for his acts, as if he were an agent originally appointed by the principal.
Agent's responsibility for sub-agent.—The agent is responsible to the principal for the acts of the sub-agent.
Sub-agent's responsibility.—The sub-agent is responsible for his acts to the agent, but not to the principal, except in cases of fraud or wilful wrong.
Title: Agent's responsibility for sub-agent appointed without authority.
Where an agent, without having authority to do so, has appointed a person to act as a sub-agent, the agent stands towards such person in the relation of a principal to an agent, and is responsible for his acts both to the principal and to third persons; the principal is not represented, by or responsible for the acts of the person so employed, nor is that person responsible to the principal.