  The present data of gallium experiments provide indirectly the only
experimental limit on the fraction of $\nu_2$ mass eigenstate for the $^8$B
neutrinos from the Sun. However, if to use the experimental data alone, the
fraction of $\nu_2$ and, consequently, $sin^2\theta_{sol}$ still is allowed to
be varied within a rather broad range. The further experimental efforts are
needed to clear this point.
