  We have investigated large single crystals of YbNi$_4$P$_2$ that were grown
from a levitating melt by the Czochralski method. The new samples facilitate
the determination of the absolute values of the electrical resistivity. Phase
pure polycrystalline samples of the non-magnetic reference LuNi$_4$P$_2$ were
prepared and the electrical resistivity was measured. Furthermore we have grown
a single crystal of the As substituted compound YbNi$_4$(P$_{1-{\it
x}}$As$_{\it x}$)$_2$, $x = 0.2$ and investigated the homogenity of the As
distribution.
