  We consider singlet magnetism for the uranium ions in UPt$_3$ and
URu$_2$Si$_2$ assuming that time-reversal symmetry is broken for the {\em
coherent state of intermediate valence}. The relative weight of the two
involved configurations should be different for UPt$_3$ and URu$_2$Si$_2$. If
in UPt$_3$ the configuration $5f^1$ on the U-ion prevails in the coherent state
below the magnetic transition, the magnetic moment would vanish for the
particular choice of the {\em ionic} wave function. In case of URu$_2$Si$_2$,
the phase transition is non-magnetic in the first approximation -- the magnetic
moment arises from a small admixture of a half-integer spin configuration.
