  After reaffirming that the macroscopic dipolar electromagnetic equations,
which today are commonly referred to as Maxwell's equations, are found in
Maxwell's Treatise, we explain from his Treatise that Maxwell defined his
displacement vector D as the electric polarization and did not introduce in his
Treatise or papers the concept of electric polarization P or the associated
electric-polarization volume and surface charge densities, -div P and Pn,
respectively. With this realization, we show that Maxwell's discussion of
surface charge density between volume elements of dielectrics and between
dielectrics and conductors becomes understandable and valid within the context
of his definition of electric polarization as displacement D. Apparently, this
identification of D with electric polarization in Maxwell's work has not been
previously pointed out or documented except very briefly in [2].
