We report results of electrical resistivity, Hall effects, and magneticsusceptibility measurements on oriented single crystals ofP/sub 4/W/sub 12/O/sub 44/, which suggest thatP/sub 4/W/sub 12/O/sub 44/ has two resistivityanomalies arising from charge-density-wave instabilities. Tight-bindingelectronic-band-structure calculations on theW/sub 6/O/sub 22/ slab ofP/sub 4/W/sub 12/O/sub 44/ support the abovesuggestion.