  We describe the Chow ring with rational coefficients of Mbar_{0,1}(P^n,d) as
the subring of invariants of a ring B(Mbar_{0,1}(P^n,d);Q), relative to the
action of the group of symmetries S_d. We compute B(Mbar_{0,1}(P^n,d);Q) by
following a sequence of intermediate spaces for Mbar_{0,1}(P^n,d).
