Using the Czochralski-Gomperz method and various specimens of zinc containing certainly less than 1 per cent Cd., Schilling encountered mosaic crystals and failed to find the region of successful growth of Hoyem and Tyndall. It has been found, however, that by using zinc containing several tenths of one per cent of Cadmium the mosaics are largely prevented and a region of growth similar to the previous one reappears
