FIFTH REPORT OF THE DIRECTOR 1908 



221 



crystals of this form correspond more closely to the form - -- R - 



= (21.49.70.32). These latter indexes are, however, too irrational 

 to warrant the establishment of the form from the material at hand 

 although the angles are given in the accompanying table for the 

 sake of comparison. 



LETTER 



ANGLE 



NUMBER 

 OF 



READINGS 



MEASURED 



CALCULATED 





























<J : ff vn 



_ . r TV 



7180 



o'/'/i 



8170 

 ■ 7°75 







6 



6 



13 

 90 



47 



J 3 

 90 



55 



OJ | \ oj ■} 



A: : A : v 



3 J 45 

 3 J 45 

 2131 



34i5 

 • 4i35 

 : 3121 







2 

 2 

 3 



49 

 15 

 35 



27 

 52 

 38 



49 

 16 



35 



22^ 



°7 



36 



p; : p ; 



1 



i34i 



: M3 1 







5 



27 



4* 



26 



44? 



p; :p ; 



V 



i34i 



: 43 11 







6 



87 



7 



87 



$oh 



b: :b j 

 b: :b : 



I 



V 



3584 

 3584 



:38?4 

 : 8^4 







1 

 1 



37 

 64 



27 



56 



37 

 64 



28 

 43 



x; :x : 

 x: :x j 



I 



V 



4. 16.20.3 

 4. 16.20 3 



: 4.20. 

 : 20.16 



t6. 



•4 • 



3 

 3 



5 

 5 



2 1 



96 



3° 

 20 



2 1 



96 



30 



26£ 



x : :x : 



VI 



4.16.20.3 



: 16.4. 



20 . 



3 



1 



42 



26 



42 



27 



o 1 : x; 





1780 



: 4.16. 



20 . 



3 



7 



10 



15 



10 



2 I 



x i : Pi 









4.16.20.3 



: 1341 







8 



7 



32* 



6 



57 



x: : to 





4. 16.20.3 



: 3 J 45 







4 



53 



12 



53 



5 



? : 



? 



21 .49.70.32 



: 2 1 . 70 



•49 



•32 



6 



74 



7 



74 



25 



? 



? 



21 .49.70.32 



: 70.49 



. 2 1 



•3 2 



7 



30 



10 



30 



3 



? 



? 



21 .49. 70.32 



: 49 . 21 



.70 



•32 



7 



60 



34 



60 



28 



