MINERAL CONSTITUENTS OF METEORITES. 
363 
The measurements thus obtained are necessarily therefore only approximative. 
The faces 1 0 0, 0 0 1, 1 0 1 on the crystals A, C, and F gave images by reflection, and in 
the case of the crystal C the face 110 gave also a fairly good image. The crystallo- 
graphic elements were determined from the last-named crystal. 
Calculated Angles. 
A. 
B. 
c. 
D. 
E. 
F. 
"1 0 0.4 0 3= 21 33 
2i 31 
1 0 1= 27 46 
27 40 
27° 48 
27 46 
27 49 
27 25 
27 55 
1 0 2= 46 29 
46 18 
46 31 
46 2 
1 0 3= 57 40 
57 34 
57 25 
0 0 1= 90 0 
90 0 
90 0 
0 0 1.1 0 3= 32 20 
32 22 
32 19 
2 0 3= 51 42 
51 32 
To 2= 43 31 
43 34 
I 01= 62 14 
62 17 
62 14 
' 1 00.0 1 0= 90 0 
110= 60 10 
60 13 
60 10 
60 10 
Tl 0=119 50 
_1 1 0 . 1 10 = 120 20 
120 23 
120 10 
' 00 1.0 1 1= 73 12 
0 10= 90 0 
90 0 
" 1 0 1.1 1 0= 63 53 
63 54 
110=116 7 
116 7 
"0 0 1.1 1 6= 32 28 
32 56 
1 1 2= 62 21 
62 21 
2 2 3= 68 33 
68 36 
110= 90 0 
90 0 
"5 4 8.0 0 1= 63 52 
64 0 
1 0 0= 58 28 
58 30 
101= 52 18 
51 48 
G. 
27 44 
57 35 
The measurements in the zone [1 0 0, 1 1 0] are of a very uncertain character, it being- 
difficult to determine accurately the angle which the plane 10 0 makes with even the 
