'' 



Prof. Dr. H. HAGA and Prof. Dr. F. M. JAEGER. "On the Symmetry of the Röntgenpalterns of Trigonal and Hexagonal Crystals." etc. 



Fig. 16. Stereographical Projection ol the Rontgcnograin 



i»f dextrogyratory Quarz. Plate parallel to (TjTo). 



(Normal Image). 



Fig. 18. Stereographical Projection of the RontRenograni 

 of Nephcline. Plate parallel to (Tlmh). 



(Abnormal Image). 



. Stereographical Projection of the f 

 f dextrogyratory Sodium-Ammunium- 

 Plate parallel to (loO). (Normal In 



Stcftographical Projection of the RöntKcnograni 

 dextrogyratory Sodiuni-AmmonUini-Tartrate. 

 Plate parallel to {» i ii). (Normal Image). 



Fig. 23. Stereographical Projection of the RÖnlgenogram 

 of dextrogyratory Sodium-AinnioHium-Tartrate. 

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



Prnceotiing^ Royal Acad. Vol. XXIV. 



Fig. 24. SttTconraphical Prujeclionof the Rontgenogram 

 of dextrogyratory Sodium-Ammonium-Tartrate. Plate 

 parallel to (ii l o). Abnormal Image, perpendicular 

 to the first one, with the same position of the plate. 



Fig. 25. Stereographical Projection ol the RÖntgcnogram 



of dextrogyratory Sndtum-Ammonium-Tartrale. 



Plate parallel to (noi). 



Fig. 26. Stereographical Projection (schematical) of the 

 Ronlgcnogram of Zinc-sulphate. Plate parallel to (o l o). 

 Abnormal Image, obtained with a perfectly clear lamella, 

 prepared by cleavage, and exactly perpendicular to 



