A Riesz space E will be defined
to be intermediate with respect to the Riesz space L if L can be embedded in E as a
Riesz subspace L∗ in such a way that the elements of E are both the infimum and
the supremum of elements in L#. The main objectives of this paper are to
investigate the extendability of certain order convergence properties from
a Riesz space to its intermediate spaces and to compare the prime ideal
structure of a Riesz space to the prime ideal structure of its intermediate
spaces.