  In this article the concept of enantiomorphism is developed in terms of
topological, rather than geometrical, concepts. Chirality is to be associated
with enantiomorphic pairs which induce Optical Activity, while Helicity is to
be associated enantiomorphic pairs which induce a Faraday effect.
Experimentally, the existence of enantiomorphic pairs is associated with the
lack of a center of symmetry, which is also serves as a necessary condition for
Optical Activity. However, Faraday effects may or may not require a lack of a
center of symmetry. The two species of enantiomorphic pairs are distinct, as
the rotation of the plane of polarization by Optical Activity is a reciprocal
phenomenon, while rotation of the plane of polarization by the Faraday effect
is a non-reciprocal phenomenon. From a topological viewpoint, Maxwell's
electrodynamics indicates that the concept of Chirality is to be associated
with a third rank tensor density of Topological Spin induced by the interaction
of the 4 vector potentials {A,phi} and the field excitations {D,H}. The
distinct concept of Helicity is to be associated with the third rank tensor
field of Topological Torsion induced by the interaction of the 4 vector
potentials and field intensities {E,B}.
