424 
DR. A. E. H. TUTTON ON THE 
Interfacial Angles of Ammonium Ferrous Selenate. 
Angle. 
No. of 
measure¬ 
ments. 
Limits. 
Mean 
observed. 
Calcu¬ 
lated. 
Diff. 
Values of 
Tops0e. 
ac =(100):(001) 
_ 
o/o / 
o / 
o / 
73 51 
/ 
e / 
as =(100):(101) 
—- 
— 
— 
45 13 
— 
— 
sc = (101):(001) 
— 
— 
— 
28 38 
— 
— 
cr = (001):(201) 
19 
64 16- 64 26 
64 22 
64 17 
5 
64 24 
cs = (001): (101) 
— 
— 
— 
38 36 
— 
— 
s'r = (101): (201) 
— 
— 
— 
25 41 
— 
— 
r'a = (201) : (100) 
— 
— 
— 
41 52 
— 
r'c = (201): (001) 
19 
115 33-115 50 
115 38 
115 43 
5 
— 
' ap =(100): (110) 
— 
— 
— 
35 30 
— 
— 
PP = (HO): (120) 
— 
— 
— 
19 28 
— 
— 
p'b = (120): (010) 
— 
— 
— 
35 2 
_ 
— 
PP'"= (HO): (130) 
— 
— 
— 
29 27 
— 
— 
p"'b = (130) : (010) 
— 
— 
— 
25 3 
— 
— 
pb =(110):(010) 
12 
54 27- 54 44 
54 33 
54 30 
3 
54 28 
pp = (110):(110) 
20 
70 46- 71 13 
71 0 
* 
— 
70 50 
pp =(110):(110) 
20 
108 41-109 17 
109 0 
109 0 
0 
— 
'cq = (001): (Oil) 
35 
25 37- 25 56 
25 44 
* 
— 
25 42 
qb = (Oil):(010) 
11 
64 11- 64 24 
64 17 
64 16 
1 
64 19 
1 
.22 =(011):(011) 
17 
128 19-128 36 
128 31 
128 32 
1 
— 
r ao =(100): (111) 
— 
— 
— 
48 25 
— 
— 
oq =(111): (011) 
— 
— 
— 
27 5 
— 
— 
aq =(100):(Oil) 
— 
— 
— 
75 30 
— 
— 
qo’ = (Oil): (Ill) 
— 
— 
— 
34 48 
• — 
34 34 
[ o'a = (Ill) : (100) 
— 
— 
— 
69 42 
— 
— 
co = (001): (111) 
— 
— 
— 
34 14 
— 
— 
op =(111):(110) 
— 
— 
— 
42 41 
— 
— 
-j 
cp =(001): (110) 
40 
76 47- 77 2 
76 55 
* 
— 
76 54 
pd = (110): (111) 
6 
58 0- 58 20 
58 10 
58 13 
3 
57 59 
dc =(111):(001) 
7 
44 41- 45 6 
44 55 
44 52 
3 
— 
[pc = (110): (001) 
40 
102 55-103 15 
103 5 
103 5 
0 
103 9 
Cbn =(010):(121) 
— 
— 
— 
54 33 
— 
— 
no =(121): (111) 
— 
— 
— 
15 51 
— 
— 
K 
bo = (010):(111) 
— 
— 
— 
70 24 
— 
— 
Us = (111) : (101) 
— 
— 
— 
19 36 
— 
— 
fbo = (010): (Ill) 
4 
65 2- 65 20 
65 11 
65 7 
4 
— 
< 
o's' = (Ill) : (101) 
— 
— 
— 
24 53 
— 
— 
fo’d = (111) : (III) 
1 
— 
49 47 
49 46 
1 
49 42 
fsq =(101): (Oil) 
— 
— 
37 45 
— 
— 
qp = (Oil):(110) 
31 
87 10- 87 22 
87 16 
87 15 
1 
87 27 
< 
ps =(110):(101) 
— 
— 
— 
55 0 
— 
— 
l Pi =(110):(Oil) 
31 
92 39- 92 52 
92 44 
92 45 
1 
— 
\s’q = (101):(Oil) 
— 
— 
— 
45 15 
— 
qn =(011):(121) 
— 
— 
— 
26 23 
— 
np = (121):(110) 
— 
— 
— 
36 29 
— 
— 
qp = (Oil):(110) 
33 
62 45- 63 1 
62 53 
62 52 
1 
62 51 
ps’ = (110) : (101) 
— 
— 
— 
71 53 
— 
— 
[pq =(110): (Oil) 
33 
116 59-117 22 
117 8 
117 8 
0 
— 
fro' = (201) : (Ill) 
7 
35 5- 35 13 
35 9 
35 9 
0 
34 56 
dp = (111):(110) 
5 
91 52- 92 21 
92 12 
92 10 
2 
— 
Vr’ = (110): (201) 
34 
52 28- 52 46 
52 36 
52 41 
5 
52 35 
[r’p = (201): (110) 
34 
127 15-127 33 
127 24 
127 19 
5 
— 
Total number of 
measurements . . 
459 
