  Recent HST/GHRS observations of the z = 0.7010 absorber toward the QSO
1718+4807 (selected because of apparently ideal characteristics for measuring
D/H) yield a D/H significantly higher D/H than some recent high-redshift
measurements. Our analysis indicates D/H}= 1.8 - 2.5 x 10^{-4}. This may
indicate a cosmological inhomogeneity in the deuterium abundance of at least a
factor of ten.
