  Magnetization, specific heat, and electrical resistivity measurements were
made on single crystals of the filled skutterudite compound
PrOs$_{4}$As$_{12}$. Specific heat measurements indicate an electronic specific
heat coefficient $\gamma$ $\sim 50-200$ mJ/mol K$^{2}$ at temperatures 10 K
$\leq T \leq 18$ K, and $\sim 1$ J/mol K$^{2}$ for $T \leq 1.6$ K.
Magnetization, specific heat, and electrical resistivity measurements reveal
the presence of two, or possibly three, ordered phases at temperatures below
$\sim 2.3$ K and in fields below $\sim 3$ T. The low temperature phase displays
antiferromagnetic characteristics, while the nature of the ordering in the
other phase(s) has yet to be determined.
