As is well known, ferritin, and its protein moiety, apoferritin, can be readily crystallized in aqueous solutions of cadmium sulphate to yield isotropic (cubic) crystals, most commonly octahedra 1.

AT normal temperatures, cæsium chloride is stable in a body-centred cubic lattice, and at higher temperatures in a simple face-centred lattice of the sodium chloride type. When single crystals were ...