The polycrystalline ceramic BiFeO3 - PbTiO3 is both ferroelectric and antiferromagnetic for a wide range of compositional space. We have shown in previous experiments that (1) large strains and stresses can be induced using the piezoelectric effect; (2) moderate stresses can change the phase from tetragonal to rhombohedral; (3) allied with this phase transition the magnetic state changes from para- to antiferromagnetic at room temperature. This proposal seeks to combine these individual observations in one experiment, and to directly alter the magnetic state with an applied electric field, showing for the first time, magneto-electric coupling in a non-composite bulk material at room temperature. Such an experiment, if successful, is of profound scientific impact.