CIVIL CODE
SECTION 2349-2351
2349.  An agent, unless specially forbidden by his principal to doso, can delegate his powers to another person in any of the followingcases, and in no others: 1. When the act to be done is purely mechanical; 2. When it is such as the agent cannot himself, and the sub-agentcan lawfully perform; 3. When it is the usage of the place to delegate such powers; or, 4. When such delegation is specially authorized by the principal.2350.  If an agent employs a sub-agent without authority, the formeris a principal and the latter his agent, and the principal of theformer has no connection with the latter.2351.  A sub-agent, lawfully appointed, represents the principal inlike manner with the original agent; and the original agent is notresponsible to third persons for the acts of the sub-agent.