  We study the consequences of recent progress in the experimental
determination of masses of neutron rich nuclei for our knowledge of the ground
state of cold dense matter. The most recent experimental data determine the
ground state of cold dense matter up to $ \rho \simeq 10^{11}~{\rm g~cm^{-3}}
$. The composition and the equation of state of the ground state of matter, in
this density interval, are calculated.
