  We re-examine the predictions of a two-phase model of shadowing in nuclear
deep-inelastic scattering in light of new NMC data on the x, A and Q**2
dependence of the ratios of structure functions. The model, which combines
vector meson dominance at low Q**2 with diffractive Pomeron exchange for large
Q**2, agrees with the observed small, but non-zero, slopes in log Q**2, which
indicate the importance of higher twist shadowing effects in the transition
region, 0.1 < Q**2 < 1 GeV**2. We note also that the latest E665 data on the
deuteron to proton ratio suggests the presence of a small amount of shadowing
in the deuteron.
