64. Can a principal evade responsibility to third persons by secret instructions given to an agent?
65. If a third party dealing with an agent knows of the secret instructions, is he bound by them?
66. Define and give an example of sub-agent.
67. Is a sub-agent responsible to the agent?
68. Is an agent ever responsible for the acts of a sub-agent?
69. What matters, if any, may an agent delegate?
70. Define and give examples of mechanical and ministerial duties.
71. Distinguish an agency requiring personal skill, discretion, and judgment, from one requiring the performance of ministerial or mechanical duties.
72. When, if at all, is an agent authorized to collect?