  A theory which uses data of the static pair-correlation function is developed
to calculate quantities associated with the viscous slowing down of supercooled
liquids. We calculate value of the energy fluctuations that determine the
number of stable bonds a particle forms with neighbors from data of the
structural relaxation time. The number of bonds and the activation energy for
relaxation are shown to increase sharply in a narrow temperature range close to
the glass temperature. The configurational entropy calculated from values of
the configurational fluctuations is found in good agreement with the value
determined from simulations.
