  We investigated numerically an Ising model coupled to two-dimensional
Euclidean gravity with spherical topology, using Regge calculus with the $dl/l$
path-integral measure to discretize the gravitational interaction. Previous
studies of this system with toroidal topology have shown that the critical
behavior of the Ising model remains in the flat-space Onsager universality
class, contrary to the predictions of conformal field theory and matrix models.
Implementing the spherical topology as triangulated surfaces of
three-dimensional cubes, we find again strong evidence that the critical
exponents of the Ising transition are consistent with the Onsager values, and
that KPZ exponents are definitely excluded.
