  It is supposed that the electron neutrino mass is related to the structures
and masses of the $W^\pm$ and $Z^0$ bosons. Using a composite model of fermions
(described elsewhere), it is shown that the massless neutrino is not consistent
with the high values of the experimental masses of $W^\pm$ and $Z^0$.
Consistency can be achieved on the assumption that the electron-neutrino has a
mass of about 4.5 meV. Masses of the muon- and tau-neutrinos are also
estimated.
