  In a previous work, a perturbative approach to a class of Fokker-Planck
equations, which have constant diffusion coefficients and small time-dependent
drift coefficients, was developed by exploiting the close connection between
the Fokker-Planck equations and the Schrodinger equations. In this work, we
further explore the possibility of similarity solutions of such a class of
Fokker-Planck equations. These solutions possess definite scaling behaviors,
and are obtained by means of the so-called similarity method.
