A Second Look at Masses and Mixings of Quarks and Leptons

The masses of quarks and leptons in units of $m_t$ are expressed in powers of $\sigma =\sqrt{m_c\mathrm{/}{m}_t}$. The regularities found suggest specific mass matrices. They reproduce all masses and mixings in striking agreement with observation. A 90 degree relative phase angle between the off-diagonal elements of up and down quark matrices leads to a maximum magnitude for CP-violation and, for the phase angle $\gamma$ of the unitary triangle, to $\gamma \simeq {90}^o$.