DR. JOHN STENHOUSE ON VEGETABLE PRODUCTS FROM INDIA. 
151 
“The white crystals, which were the purer portions of the distilled stearopten, 
have the following figure and measurements: — 
“ Oblique-. — Symbols of the simple forms : — 
a 100, h 010, c 001, 
m 1 1 0 , e 2 1 0 , r' 1 1 1 . 
Angles between normals to the faces : — 
be 
90 
0 
ca 
103 
23 
ab 
90 
0 
ea 
42 
17 
ec 
61 
6 
ma 
49 
21 
mb 
40 
39 
me 
98 
40 
cm' 
81 
20 
rc 
49 
18 
rm 
49 
22 
em 
61 
1 1 
re 
42 
13 
rm' 
76 
36 
mm' 
81 
18 
rr' 
108 
50 
“ Cleavage : — m, c very perfect. 
“ The brown crystals. 
Rhombohedral-. — Symbols of the simple forms, a Oil, r 100, e OIL 
Angles between normals to the faces : — 
aa! 60 0 
rr' 98 38 
re' 49 19 
ra! 40 41 
The faces e, a, are 
Cl" 
“ Cleavage : — r very perfect, 
narrow. 
“The white crystals are very thin in a direction perpendicular to the faces c. It is 
remarkable, that though they have the character of crystals of the oblique system, 
the cleavages make with each other very nearly the same angles as the cleavages of 
the brown crystals. The differences fall within the probable errors of observation : 
for the crystals, being very tender, and frequently having lost a portion of the origi- 
nal surface by evaporation, do not admit of very accurate measurement. 
“ In the brown crystals the cleavages are parallel to the faces r, r', r", and the 
X 2 
