Prof. Dr. H. HAGA and Prof. Dr. 



Fig. 15. Stereographical Projection of tlic 

 of dextrogyratory Quarz. Plate parallel 



PLATE VII. 



Stereographical Projection of the Röntgenogram 

 of Nepheline. Plate parallel to (TiTo). 



Fig. 19. Stereographical Projection of the 22. Stereographical Projection of the Röntgenogr 

 of dextrogyratory Cinnabar. Plate parallel „, dextrogyratory Sodium-Ammonium-Tartrate. 



Plate parallel to (o 1 o). (Normal Image). 



Fig. 23. Stereographical Projection of the 

 of dextrogyratory Sodium-Ammoniuin 

 Plate parallel to (010). (Abno 



Proceeding'^ Royal Acad. Vol. XXI 



26. Stereographical Projection (schematical) of the 

 tgenograni of Zinc-sulphate. Plate parallel to (0 1 0). 

 lormal Image, obtained with a perfectly clear lamella, 

 jarcd by cleavage, and exactly perpendicular to 

 the first biasectrix. 



