  The OGLE data$^1$ for Einstein ring crossing times, $t_E$, for microlensing
events toward the galactic bulge are analyzed. The analysis shows that the
crossing times are bimodal, indicating that two populations of lenses could be
responsible for observed microlensing events. Given the possibility that
microlensing in this direction can be due to both main-sequence stars and white
dwarfs, we analyze and show that the observed bimodality of $t_E$ can be
derived from the accepted density distributions of both populations. Our
Kolmogorov-Smirnov (KS) one sample test shows that that a white dwarf
population of about $25% $ of all stars in the galaxy agrees well with the
observed bimodality with a KS significance level greater than 97%.
