j PROF. DR. F. M. JAEGER. PLATE III. 
NEW PHENOMENON, ACCOMPANYING THE DIFFRACTION OF RÖNTGEN-RAYS 
IN BIREFRINGENT CRYSTALS, 
Fig. 10. 
4 Benitoite; plate parallel to Loro 
Fig. 9. d = 152 m.M.; A = 50 m. 
| Hambergite; plate perpendicular to the c- axis. 
d = 152 m.M.; A = 50 m.M. 
Fig. 11. Fig. 12. 
Benitoite; plate parallel to {aio} gig plate parellel to {0001 
d = 1.50 m.M.; A = 50 m.M = 1.50 m.M.; A = 50 m 
Proceedings Royal Academy Amsterdam Vol. XVII. HELIOTYPIE, VAN LEER, AMSTERDAM. 
