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SUBSTITUTE, contracts. One placed under another to transact business for him; in letters of attorney, power is generally given to the attorney to nominate and appoint a substitute.
     2. Without such power, the authority given to one person cannot in general be delegated to another, because it is a personal trust and confidence, and is not therefore transmissible. The authority is given to him to exercise his judgment and discretion, and it cannot be said that the trust and confidence reposed in him shall be exercised at the discretion of another. 2 Atk. 88; 2 Ves. 645. But an authority may be delegated to another, when the attorney has express power to do so. Bunb. 166; T. Jones, 110. See Story, Ag. Sec. 13, 14. When a man is drawn in the militia, he may in some cases hire a substitute.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in periodicals archive ?
That's why the district has, for the past 15 years, required that subs go through a training day.
"Training subs is a very serious issue when you think of the ramifications for kids."
"With the economy we've been able to secure enough to meet our needs," says Coffey, whose substitute pool is currently at about 1,600 for the 600 or 700 subs needed daily.
"The subs around here are becoming pretty selective of where they want to go," Haas says.