OF THE DOUBLE SELENATES OF THE SERIES R,M(Se04)2,6H20. 
275 
Comparison of the Morphological Angles of the Three Magnesium Salts. 
Angle. 
Potassium 
salt. 
Difference. 
Rul;)i(lium 
salt. 
Difterence. 
Csesium 
salt. 
' ac 
100 : 
001 = B 
o 
75 
f 
42 
/ 
- 56 
o 
74 
/ 
46 
-63 
o 
73 
43 
as 
= 
100 : 
101 
46 
30 
-40 
45 
50 
-47 
45 
3 
sc 
= 
101 ; 
001 
29 
12 
— 
28 
56 
— 
28 
40 
■< 
cr' 
= 
001 ; 
201 
62 
53 
+ 44 
63 
37 
+ 54 
64 
31 
cs' 
= 
001 : 
lOl 
38 
1 
— 
38 
20 
— 
38 
46 
s'r 
= 
101 : 
201 
24 
52 
+ 25 
25 
17 
+ 28 
25 
45 
r'a 
= 
201 : 
100 
41 
25 
— 
41 
37 
— 
41 
46 
r ap 
100 : 
110 
35 
55 
- 17 
35 
38 
-32 
35 
6 
pp' 
= 
110 ; 
120 
19 
28 
— 
19 
28 
— 
19 
28 
i 
2)’h 
= 
120 : 
010 
34 
37 
+ 17 
34 
54 
+ 32 
35 
26 
Iph 
= 
110 : 
010 
54 
5 
— 
54 
22 
— 
54 
54 
r cq 
= 
001 : 
Oil 
26 
0 
-13 
25 
47 
- 18 
25 
29 
= 
Oil ; 
010 
64 
0 
— 
64 
13 
— 
64 
31 
^ ao 
— 
100 : 
111 
49 
43 
-40 
49 
3 
-52 
48 
11 
oq 
= 
111 : 
Oil 
27 
27 
- 11 
27 
16 
- 7 
27 
9 
aq 
= 
100 ; 
on 
77 
10 
-51 
76 
19 
-59 
75 
20 
qd 
= 
Oil : 
111 
34 
16 
+ 18 
34 
34 
+ 26 
35 
0 
^ da 
= 
Ill : 
loo 
68 
34 
+ 33 
69 
7 
+ 33 
69 
40 
' CO 
001 : 
111 
34 
54 
-21 
34 
33 
-26 
34 
7 
op 
= 
111 : 
no 
43 
34 
-27 
43 
7 
-30 
42 
37 
cp 
= 
001 : 
no 
78 
28 
-48 
77 
40 
-56 
76 
44 
. 
pd 
= 
110 ; 
111 
57 
13 
+ 32 
57 
45 
+ 39 
58 
24 
o'c 
= 
111 : 
001 
44 
19 
+ 16 
44 
35 
+ 17 
44 
52 
J 
'ho 
010 : 
111 
69 
57 
+ 17 
70 
14 
+ 25 
70 
39 
1 
^os 
= 
111 : 
101 
20 
3 
— 
19 
46 
— 
19 
21 
{ho' 
010 : 
Ill 
65 
16 
- 1 
65 
15 
+ 7 
65 
22 
\ o's' 
= 
Ill : 
101 
24 
44 
— 
24 
45 
—■ 
24 
38 
'sq 
101 : 
on 
38 
19 
-19 
38 
0 
-23 
37 
37 
qp 
= 
Oil : 
no 
85 
34 
+ 55 
86 
29 
+ 73 
87 
42 
1 
^ps 
= 
110 : 
loi 
56 
7 
-36 
55 
31 
-50 
54 
41 
's'q 
= 
101 : 
on 
44 
55 
+ 9 
45 
4 
+ 12 
45 
16 
qp 
= 
Oil : 
no 
64 
5 
-33 
63 
32 
- 34 
62 
58 
1 
,ps' 
no : 
101 
71 
0 
+ 24 
71 
24 
+ 22 
71 
46 
' r'd 
201 : 
Ill 
34 
30 
+ 18 
34 
48 
+ 15 
35 
3 
\ 
dp 
= 
Ill : 
no 
92 
54 
- 17 
92 
37 
- 3 
92 
34 
1 
^pr 
110 ; 
201 
52 
36 
- 1 
52 
35 
-12 
52 
23 
The Cleavage Direction of all three salts is identical, namely, parallel to the 
orthodome r'{201], which is also common to the whole of the salts of the series yet 
studied. 
2 N 2 
