106 
Proceedings of the Royal Society of Edinburgh. [Sess. 
List of 1000 Rocks 
Group. 
Si0 2 . 
Ti0 2 . P 2 0 5 . 
H 2 0. 
A1 2 0 3 . 
Fe 2 0 3 . 
FeO. 
MgO. CaO. 
Na 2 0. 
K 2 0. 
Total. 
Sp. Gr. 
16 
a a b b b b 
62-4 
2*0 
20-2 
5-3 
•9 
1-1 
3-9 
5-8 
101-6 
2-50? 
57-9 
2-4 
19-1 
2-5 
1*1 
1-2 
6-6 
9-2 
100-0 
• • • 
57-0 
2-9 
16-7 
2-5 
5-3 
•7 
2-0 
1*4 
11-7 
100-2 
2-68 
56-3 
•5 
1-8 
23*6 
•8 
2-7 
•3 
•5 
7-8 
5-7 
99-9 
. . . 
55-1 
1-1 
233 
3*3 
1-5 
6-8 
8-9 
99-8 
... 
53-5 
1*4 
24*3 
11 
1*2 
•1 
•8 
8-6 
89 
99-9 
... 
6 rocks 
57-0 
•1 
1-9 
21-2 
1*7 
2*4 
L 
1*2 
5*8 
8-4 
100-2 
2-60 
±2'5 
±2-5 
±1-6 
~^6~ 
±24 
±9-3 
17 
aba 
a a a 
75-5 
1*4 
9*6 
1-7 
4-3 
1*3 
1-0 
51 
•6 
100-4 
72-3 
1-8 
9*0 
6-3 
1-1 
•o 
1-9 
5-8 
1-5 
99*8 
2*6*6 
72-2 
•4 
•1 
•9 
13-8 
1*5 
2-0 
1-1 
3*5 
4’4 
•4 
100-3 
71*6 
1-0? 
10-5 
3-9 
2-2 
5-4 
2-7 
1-9 
•8 
100-0 
70-4 
(1*8) 
*3 
7-9 
7-0 
3*0 
•5 
•3 
4-1 
4*5 
100-6 
... 
70-3 
•8 
6-3 
9-2 
1*4 
•9 
•8 
7-7 
2*5 
ioo-o 
69-8 
(2*9) 
12-3 
4-7 
'7 
1-7 
6-7 
2-0 
100-8 
, . . 
69-3 
•6 
13-4 
4-8 
1*6 
5-1 
33 
1-8 
99-9 
68-0 
*3 
16*1 
4*4 
•5 
59 
4-3 
•5 
ioo-o 
67-8 
*5 
•2 
1-0 
14*0 
5-2 
1*0 
4-3 
5*2 
1*2 
100-3 
2*71 
64*9 
•4 
•2 
3*0 
14*3 
5*7 
2*0 
5-5 
3-5 
•9 
100-4 
2*87 
11 rocks 
70-2 
•3 
•1 
1-2 
11-6 
3*8 
2-4 
1-4 
3-0 
4-7 
1*5 
100-2 
2-76 
y 
±2-1 
±2-6 
±1-7 
±2-2 
±1-9 
±10-5 
18 
aba 
a a b 
69-1 
16*3 
3*7 
1*4 
IT 
5*1 
2-9 
1*1 
100-7 
2-46 
67-9 
•9 
•2 
•7 
12*2 
4*2 
3-0 
1*2 
2-0 
3-8 
4*5 
100-5 
66*9 
•2 
15-2 
6-5 
2-4 
3-7 
33 
•9 
99-1 
2-7*2 
66-8 
•6 
•2 
•6 
15-2 
2*7 
1-8 
1*6 
3*7 
31 
4-5 
100-8 
66-7 
•4 
•1 
•9 
16-1 
1-5 
2*5 
1-7 
4-6 
3-4 
2-7 
100-6 
66-3 
1*1 
14-3 
5*5 
•3 
2-4 
4-6 
3-9 
1*6 
ioo-o 
2-65 ? 
65*9 
•8 
•2 
3-6 
13-7 
•5 
5-7 
2-3 
3-0 
2*8 
1-6 
100-3 
65-9 
•4 
•8 
14-9 
1*8 
3*1 
2*9 
4‘6 
2-1 
4-2 
100-8 
2-9*0 
65-2 
1*1 
15-6 
2-1 
3-7 
2-4 
6*7 
2-5 
1*5 
100-8 
65*1 
•3 
2-6 
16-2 
33 
•9 
1*8 
43 
3-4 
2-4 
100-2 
2-57 
63-9 
•6 
•1 
1*9 
15-8 
1-9 
2-8 
2-1 
4-8 
3 3 
31 
100-3 
63-9 
•7 
•2 
1-2 
15*8 
2-1 
2-7 
2-1 
4T 
2*8 
4-3 
99-9 
63-5 
2*9 
12-4 
6*4 
2-2 
1*3 
4-2 
4-9 
1*8 
99-6 
2*52 
62-2 
2-3 
15-6 
5-3 
1*4 
2-6 
6-6 
2-5 
1-6 
ioo-o 
2-57 
62‘0 
4-6 
15-2 
2*1 
2-0 
3-2 
5-5 
3-2 
1*7 
99-3 
61-0 
1-2 
*3 
5-4 
13-9 
1-6 
37 
1*6 
4*0 
2-8 
4-2 
99-8 
2-63 
16 rocks 
65*1 
•4 
•1 
1*8 
14-9 
2-8 
2*7 
y 
2-0 
4-5 
y 
3*2 
2-6 
y 
100-2 
2-64 
±i-i 
±1-0 
±i*o 
±1*2 
±1-2 
(±5-5) 
