Optical and electrical measurements on thin sections of Bi4Ti3O12in orientations not previously measured have yielded the following results. The symmetry is monoclinic, point groupm.The spontaneous polarizationPsis greater than 30 &mgr;C/cm2and lies in a direction tilted slightly from the major crystal surface. Switching, with fields perpendicular to the major crystal surface, occurs by a small ``rocking'' of this largePsvector. The large component parallel to the major crystal surface can also be switched with high fields. Thus, there are four possible spontaneous polarization directions in the virgin crystal giving rise to complex domain structures.