  We have recently proposed an explanation for the birth velocities of pulsars
as resulting from asymmetries due to neutrino oscillations in the cooling
protoneutron star. A specific prediction of this mechanism is that the
correlation of velocities and magnetic fields should be stronger for slowly
rotating neutron stars and weaker for those whose periods are less than 1 s. A
remarkable agreement of this prediction with the data favors the oscillation
mechanism over the alternative explanations for the proper motion of pulsars.
