  High energy jet distributions measured since 1992 at the Fermilab Tevatron
proton--antiproton collider are presented and compared to theoretical
predictions. The statistical uncertainties on these measurements are
significantly reduced relative to previous results. The systematic
uncertainties are comparable in size to the uncertainty in the theoretical
predictions. Although some discrepancies between theory and measurements are
noted, the inclusive jet and dijet cross sections can be described by quantum
chromodynamics. Prospects for reducing the uncertainty in the theoretical
predictions by incorporating Tevatron measurements into the proton parton
distributions are discussed. Dijet distributions, in excellent agreement with
quantum chromodynamics, set a 2.5 TeV limit on the mass of quark constituents.
