Some unmeasured crystal properties

The subject of this paper is three macroscopic properties of crystals: Jones birefringence, non-reciprocal linear birefringence along a cube edge in certain magnetic cubic crystals, and the static magneto-electric coefficient of magnetic cubic crystals which exhibit this effect. As each of these properties has a particular theoretical interest, and as they remain, as yet, unmeasured, a background account is presented of each, together with the theory, in multipole form, of experiments which would allow the three properties to be measured.