  Lithium abundances in a selected sample of halo stars have been revised by
using new accurate Teff. From 41 plateau stars we found no evidence for
intrinsic dispersion, a tiny trend with Teff and no trend with [Fe/H]. These
results argue against depletion by either stellar winds, diffusion or
rotational mixing. Therefore the Li observed in PopII stars provides a reliable
estimate of the baryonic density. A more detailed discussion can be found in
Bonifacio & Molaro (1996).
