  The classical Schubert cells on a flag manifold G/H give a cell decomposition
for G/H whose Kronecker duals (known as Schubert classes) form an additive base
for the integral cohomology H^{\ast}(G/H).
  We present a formula that expresses Steenrod mod-p operations on Schubert
classes in G/H in terms of Cartan numbers of G.
