  We explain how Regge theory and perturbative evolution may be made compatible
at small x. The result not only gives striking support to the two-pomeron
description of small-x behaviour, but gives a rather clean test of perturbative
QCD itself. When x is very small, or Q^2 is very large, the proton's gluon
distribution function is significantly larger than is commonly believed.
Perturbative evolution is invalid below Q^2\approx 5 GeV^2.
