— 
Pror. DR. F. M. JAEGER. PLATE I. 
A NEW PHENOMENON, ACCOMPANYING THE DIFFRACTION OF RONTGEN-RAYS 
IN BIREFRINGENT CRYSTALS. 
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4 Ps . 
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Fig. 1. Fig. 2. 
Dextrogyratory Sodiumchlorate. Plate parallel to (100). Laevogyratory Sodiumchlorate, Plate parellel to (100). 
d = 2,95 m.M.; A = 45.8 mM. = 2.25 mM.; A = 45.7 m.M. 
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a, 
5 
Fig. 3. Fig. 4. 
Apatite; plate perpendicular to the c-axis. Turmaline ; plate perpendicular to the c- axis. 
d= 15 m.M.; A = 43 m.M. d = 1.1 m.M.; A = 44 m.M. 
Proceedings Royal Academy Amsterdam Vol. XVII. HELIOTYPIE, VAN LEER, AMSTERDAM 
