Results of Crystal Analysis, 405 



distribution of intensities, while the first-order spectrum of 

 (110) is very much reduced, we at once conclude that the 

 latter possibility is excluded. 



For the sake of convenience, we introduce the following 

 new parameters : 



«=^27r, /3=^27r, y = l n 2ir 9 S=^2tt. . (9a) 

 a c ' c c K ' 



Sometimes it will also be convenient to introduce 



toon 



7 = 7T— 7. 



(9 6) 



Fig. 3. 



<iei) 



C N £ / C 



C I C N 



i \\A 



-5TT 



c *l 3 



C I C^N C 



ft 



t 



(III) 



I CJ i l i 



N C 2 C 2 N C 2 I 



(100) 



INC? 



2<* 



INC 9 



<II0) 



i t 



Fig. 3 gives the distribution of point planes for the 

 five faces considered, and their position is given in terms 

 of the angular parameters. 



