Plate 3. Stereograpcical Projection of the Röntgen-patterii of dextrogyratory 

 Quartz. Plate parallel to (1210). (Normal Image). 



Fig. 4. Stereographical Projection of ttie Röntgen-pattern of dextrogyratory 

 Quartz. Plate parallel to (T 2 1 0). (Abnormal Image). 



