Abstract
A field theory of electric and magnetic monopoles which are either point or extended particles is constructed, using Mandelstam's path-dependent field quantities specialized to straight-line paths. Restrictions on the paths and form factors which are needed for self-consistency have been given. It is found that the Jacobi identity is satisfied. Schiff's selection principle for quarks, originally derived in ordinary quantum mechanics, follows easily and is thus generalized to field theory.

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