It is proposed that the temperature of mesomorphic-isotropic phase changes and of transitions between mesophases may be markedly shifted by manageable electric fields. First experiments demonstrating such a shift in the nematic-isotropic transition of $p$-ethoxybenzylidene-$p^{\prime }$-aminobenzonitrile are reported.

• Received 21 November 1969

DOI:https://doi.org/10.1103/PhysRevLett.24.201