  The solid-solution SrRu$_{1-x}$Rh$_x$O$_3$ ($0\le x \le1$) is a
variable-electron-configuration system forming in the nearly-cubic-perovskite
basis, ranging from the ferromagnetic 4$d^4$ to the enhanced paramagnetic
4$d^5$. Polycrystalline single-phase samples were obtained over the whole
composition range by a high-pressure-heating technique, followed by
measurements of magnetic susceptibility, magnetization, specific heat,
thermopower, and electrical resistivity. The ferromagnetic order in long range
is gradually suppressed by the Rh substitution and vanishes at $x \sim 0.6$.
The electronic term of specific-heat shows unusual behavior near the critical
Rh concentration; the feature does not match even qualitatively with what was
reported for the related perovskites (Sr,Ca)RuO$_3$. Furthermore, another
anomaly in the specific heat was observed at $x \sim 0.9$.
