We discuss rst the avor mixing of the quarks, using the texture zero mass matrices. Then we study a similar model for the mass matrices of the leptons. We are able to relate the mass eigenvalues of the charged leptons and of the neutrinos to the mixing angles and can predict the masses of the neutrinos. We nd a normal hierarchy - the masses are 0.004 eV, 0.01 eV and 0.05 eV. The atmospheric mixing angle is given by the mass ratios of the charged leptons and the neutrinos. We nd about 40, consistent with the experiments. The mixing element, connecting the rst neutrino with the electron, is predicted to be 0.05. This prediction can soon be checked by the Daya Bay experiment.
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