  We report the magnetic, electronic and transport properties of the
quasi-skutterudite compound Pr$_3$Ir$_4$Ge$_{13}$ by means of magnetic
susceptibility $\chi(T)$, electrical resistivity $\rho(T)$, specific heat
$C_p(T)$, thermal conductivity $\kappa(T)$, thermoelectric power $S(T)$ and
Hall coefficient $R_\mathrm{H}(T)$ measurements. Pr$_3$Ir$_4$Ge$_{13}$ does not
show any phase transition down to 1.9 K. Magnetic, and specific measurements
show that the system possesses a crystal electric field singlet ground state
that is separated from the first excited state by about 37 K. $\rho(T)$ shows a
negative temperature coefficient of resistance for the whole temperature range
studied and which can be explained in terms of Mott's impurity band conduction
mechanism. $R_\mathrm{H}(T)$ measurements show that Pr$_3$Ir$_4$Ge$_{13}$ is a
low-carrier density semimetal and its transport properties indicate a
metallic-non metallic cross over behaviour. Large Seebeck values were observed
for the entire temperature range of investigation, and the analysis of
temperature variation of $S$ and $S/T$ showed no sign of strong correlation
between the Pr 4$f^2$ and conduction electron states near Fermi level. A large
Sommerfeld coefficient, $\gamma = 150$~mJ/(mol K$^2$) indicates the formation
of a moderate heavy-fermion state emerging from the dynamical crystal field
fluctuations.
