  We reconsider the Dirac-Foldy contribution $\mu^2/m$ to the neutron electric
polarizability. Using a Dirac equation approach to neutron-nucleus scattering,
we review the definitions of Compton continuum ($\bar{\alpha}$), classical
static ($\alpha^n_E$), and Schr\"{o}dinger ($\alpha_{Sch}$) polarizabilities
and discuss in some detail their relationship. The latter $\alpha_{Sch}$ is the
value of the neutron electric polarizability as obtained from an analysis using
the Schr\"{o}dinger equation. We find in particular $\alpha_{Sch} =
\bar{\alpha} - \mu^2/m$ , where $\mu$ is the magnitude of the magnetic moment
of a neutron of mass $m$. However, we argue that the static polarizability
$\alpha^n_E$ is correctly defined in the rest frame of the particle, leading to
the conclusion that twice the Dirac-Foldy contribution should be added to
$\alpha_{Sch}$ to obtain the static polarizability $\alpha^n_E$.
