  The construction of the scalar theory based on the concept of gravity as
Archimedes' thrust is briefly summarized, emphasizing the two (extreme)
possibilities that result from this concept for the gravitational rod
contraction: it can either occur in only one direction, or be isotropic. A
modified equation for the scalar field is stated for the new, isotropic case.
The reasons to consider this case are: i) it is almost as natural as the other
case, and ii) it should avoid the violation of the weak equivalence principle,
found for a small extended body with the directional contraction. The dynamical
equation stays unchanged.
