gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1886.007.33.15 On the Relations between the Solution-Planes of Crystals and Those of Secondary Twinning; and on the Mode of Development of Negative Crystals along the Former. A Contribution to the Theory of Schillerization Judd John W.Prof. F.R.S., P.G.S. 12 1886 7 33 81 92 Copyright © 1886, The Mineralogical Society 1886