  Results are presented on $\pi^\pm$, $K^\pm$, and $\bar{p}$ transverse mass
spectra and particle multiplicity ratios at mid-rapidity in Au+Au collisions at
$\sqrt{s_{_{\rm NN}}}$=130 and 200 GeV and in p+p collisions at $\sqrt{s}$=200
GeV. Comparisons are made to results from lower energies. The bulk properties
of the collision inferred from these results are discussed.
