  We review our argument on the nature of the so-called meteorite constraint on
the possible time-dependence of the fine-structure constant, emphasizing that
dating meteorites at the present time is different in principle from searching
directly for the traces in the past, as in the Oklo phenomenon and the QSO
absorption lines. In the related literature, we still find some arguments not
necessarily consistent with this difference to be taken properly into account.
It does not immediately follow that any model-dependent approaches are useless
in practice, though we cannot help suspecting that dating meteorites is no
match for the Oklo and the QSO in probing the time-variability of the
fine-structure constant, at this moment. Some of the relevance to the QSO data
particularly in terms of the scalar field will be discussed.
