224 
DR. A. E. H. TUTTON ON THE 
Comparison of the Interfacial Angles (continued). 
Angle. 
KNi selenate. 
RbNi selenate. 
CsNi selenate. 
AmNi selenate. 
'ap = (100):(110) 
o / 
35 54 
© / 
35 30-5 
° 
34 58 
© / 
35 22 
J 
VP = (110):(120) 
19 28 
19 28 
19 28 
19 28 
1 
p'b = (120): (010) 
34 38 
35 1-5 
35 34 
35 10 
I 
,pb =(110):(010) 
54 6 
54 29-5 
55 2 
54 38 
/ cq =(001): (Oil) 
26 6 
25 53 
25 37 
25 51 
\qb =(011): (010) 
63 54 
64 7 
64 23 
64 9 
ao =(100):(111) 
49 30 
48 49 
48 2 
48 10 
oq =(111):(011) 
27 33 
27 25 
27 25 
27 13 
-< 
aq =(100):(Oil) 
77 3 
76 14 
75 27 
75 23 
qo = (011): (Ill) 
34 26 
34 50 
35 19 
35 7 
Ja = (Ill) : (100) 
68 31 
68 56 
69 14 
69 30 
[go = (001): (111) 
35 0 
34 40 
34 23 
34 22 
op = (111) : (110) 
43 20 
42 54 
42 25 
42 25 
i 
cp =(001): (110) 
78 20 
77 34 
76 48 
76 47 
pd = (110):(111) 
57 7 
57 34 
58 0 
58 0 
[o'c = (111) : (001) 
44 33 
44 52 
45 12 
45 13 
J 
[bo =(010):(111) 
69 56 
70 14 
70 36 
70 23 
1 
[08 =(111): (101) 
20 4 
19 46 
19 24 
19 37 
fbd = (010) : (Ill) 
65 10 
65 12 
65 19 
65 2 
\ os' = (Ill): (101) 
24 50 
24 48 
24 41 
24 58 
\sq =(101): (Oil) 
38 27 
38 9 
37 55 
37 56 
qp =(011):(110) 
85 37 
86 34 
87 36 
87 20 
IP* =(H0): (101) 
55 56 
55 17 
54 29 
54 44 
Cs'q = (101): (011) 
45 10 
45 21 
45 39 
45 37 
< 
q P = (Oil):(110) 
63 55 
63 26 
63 1 
62 44 
[ ps ' = (110): (101) 
70 55 
71 13 
71 20 
71 39 
Cr'd = (201) : (Ill) 
34 38 
34 52 
35 4 
35 16 
< 
dp = (Ill):(110) 
92 54 
92 47-5 
92 57 
92 22 
l pr' = (110): (201) 
52 28 
52 20-5 
51 59 
52 22 
These angles have all been carefully compared for the four salts and the differences 
tabulated, an analysis of the tables affording the following results. For thirty-five 
of the thirty-six angles compared the value for the rubidium salt is intermediate 
between the values for the potassium and csesium salts. 
The average and maximum changes of angle for the various replacements of one 
alkali base by another are given in the small table which follows, which forms an 
expressive summary of the tables of differences above referred to. 
