Fig. 2b. Stereographical Projection of the abnormal Diffraction-pattern of a dextro- 
or laevogyratory Complex of Muscovite-lamellae, crossing at 60°. 
Fig. 3a. Stereographical Projection of the normal Diffraction-image of a dextro- 
or laevogyratory Complex of Muscovite-lamellae. crossing at 45°. 
