193 



patterns in general 1 ), a series of optical anomalous crystals were 



Fig. 150. 



Garnet; section parallel to 110}. 



Fig. 152. 

 Fluorspar] section parallel to 100} and 



Fig. 151. 

 Analcite\ section parallel to 100} 



Fig. 153. 



Perowskite\ section parallel 

 to 100}. 



Fig. 154. Fig. 155. 



Apophyllite; section parallel to 001 }. Rutile; section parallel to 001 }. 



also investigated: besides boracite and leucite already mentioned, 



J ) Cf.: H. Haga and F. M. Jaeger, Proceed. Kon. Akad. v. Wet. Amsterdam, 

 Vol. 16, 792, (1914); 17, 438, 1204, (1915); 18, 542, 559, 1201, 1250, 1350, 

 1357, 1552, (1916). 



13 



