  In bilayer quantum Hall systems at filling fractions near nu=1/2+1/2, as the
spacing d between the layers is continuously decreased, intra-layer
correlations must be replaced by inter-layer correlations, and the composite
fermion (CF) Fermi seas at large d must eventually be replaced by a composite
boson (CB) condensate or "111 state" at small d. We propose a scenario where
CBs and CFs coexist in two interpenetrating fluids in the transition. Trial
wavefunctions describing these mixed CB-CF states compare very favorably with
exact diagonalization results. A Chern-Simons transport theory is constructed
that is compatible with experiment.
