480 DR. JOHN STENHOUSE ON THE OILS PRODUCED BY SULPHURIC ACID. 
OpaJte Crystals of Nitrate of Furf urine. 
Crystals obtained from a solution in alcohol, which effloresced readily, and became 
in consequence opake. 
These crystals belong- to the anorthic system. 
The symbols of the simple forms are, — s 100, r 010, a 001, wOll, z 101, e 110, Ml 1. 
d^he angles between normals to the faces are, — 
O i 
se 
58 
50 
re 
65 
50 
sr' 
55 
20 
xs 
76 
50 
zx 
57 
17 
zs' 
45 
53 
te 
47 
58 
xt 
51 
14 
xe' 
80 
48 
vr 
52 
49 
ux 
60 
21 
xr' 
66 
50 
ns' 
69 
57 
til 
55 
31 
st 
54 
32 
ze' 
54 
43 
uz 
49 
40 
eu 
75 
37 
C' 
e 
/ 
