Summary

William Strong Butler v. Maples — Opinion of the Court

Authority to buy for a principal a single article of merchandise by one contract, or to buy several articles from a person named, is a special agency, but authority to make purchases from any persons with whom the agent may choose to deal, or to make an indefinite number of purchases, is a general agency. And it is not the less a general agency because it does not extend over the whole business of the principal. A man may have many general agents-one to buy cotton, another to buy wheat, and another to buy horses.
Source: Wikisource

William Strong Butler v. Maples — Opinion of the Court

So he may have a general agent to buy cotton in one neighborhood, and another general agent to buy cotton in another neighborhood. The distinction between the two kinds of agencies is that the one is created by power given to do acts of a class, and the other by power given to do individual acts only. Whether, therefore, an agency is general or special is wholly independent of the question whether the power to act within the scope of the authority given is unrestricted, or whether it is restrained by instructions or conditions imposed by the principal relative to the mode of its exercise.
Source: Wikisource

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