98 
Proceedings of the Royal Society of Edinburgh. [Sess. 
List of 1000 Rocks 1 
Group . 
Si0 2 . 
Ti0 2 . P 2 ^5* 
H 2 0 . 
A1 2 0 3 . 
Fe 2 0 3 . FeO . 
MgO . CaO . 
Na 2 0 . 
K 2 0 . 
Total . 
Sp . Gr . 
7 
73*5 
•4 
12-5 
3-6 
•3 
5-6 
4-0 
100*0 
2-58 
735 
•4 
14-4 
•5 
1*5 
•3 
1*3 
4-0 
4*3 
100-2 
73-5 
•3 
*8 
14-8 
1-1 
•4 
•5 
4*4 
4-2 
100-0 
73*5 
'1 
1*2 
15-3 
•8 
•8 
4-7 
3*9 
100-2 
73-0 
1-3 
15-2 
1-9 
1-0 
•6 
3-4 
4-1 
100-5 
72-8 
•5 
■6 
12-8 
2*6 
1*9 
•3 
•6 
3*2 
5*2 
100-3 
72*3 
1-3 
133 
23 
2*0 
•4 
•1 
4-1 
4-4 
100-2 
72*1 
1-1 
14*8 
2-2 
•3 
1-6 
2-8 
5*1 
ioo-o 
2 : 66 
71-8 
1-2 
15-9 
4-2 
*5 
3 2 
4-1 
1-1 
101-9 
71-2 
1*6 
13-8 
3-2 
•8 
•3 
1-3 
6-3 
1*6 
100-1 
2 * 7*1 
71-2 
1-5 
14-4 
3-4 
•6 
1*5 
31 
4*1 
99-8 
2-62 
70-0 
1*0 
1-3 
133 
4-9 
•7 
1*8 
33 
3-5 
99-8 
69*3 
1-2 
17-3 
2 : 5 
1*2 
3-8 
4*3 
1*7 
99-9 
69-0 
•5 
3*2 
16-9 
•9 
1*0 
4-6 
3-9 
100-0 
68-5 
2*6 
14-7 
3-9 
•3 
3-9 
2*3 
3-4 
100-6 
* * * 
19 rocks 
72*3 
•2 
1*1 
14-5 
2-1 
•8 
*3 
1-2 
4-0 
37 
100-2 
2-64 
± 1-1 
±1-0 
± 1-1 
±*8 
±•9 
(± 4 - 9 ) 
8 
a a a 
b b b 
737 
12-4 
4-2 
•9 
2-2 
6*6 
ioo-o 
72-2 
1*5 
14*5 
1*8 
•9 
•9 
1-9 
6-1 
99-8 
2 - 6*2 
72*1 
•5 
15-8 
2‘7 
1*3 
2-0 
3-1 
3-1 
100-6 
71-4 
* 
1*7 
15-4 
•3 
2-3 
•2 
•5 
2-8 
5-5 
100-1 
2-65 
70-7 
1*2 
16-2 
1-5 
•5 
•6 
•5 
8-7 
99-8 
2-62 
70-6 
1-6 
17-6 
1*7 
2-0 
•8 
5-1 
99-6 
( 2 - 29 ) 
69*6 
•7 
17-4 
1-0 
2*0 
•2 
1-4 
3-5 
4*1 
999 
2-72 
69-3 
17-4 
2 : 3 
•3 
2-3 
3*6 
2-8 
98-0 
69*2 
•2 
•6 
17-5 
1*1 
3:1 
FO 
2-9 
2-7 
3-0 
101-3 
68-6 
3-4 
16-4 
*7 
1*5 
•1 
1-8 
2*8 
4-7 
ioo-o 
2*42 
68-4 
1*6 -3 
1*6 
13-8 
2*6 
2-7 
•7 
•7 
3-6 
4*5 
100-5 
68-4 
1*9 
16-9 
3 # 0 
1-5 
4-3 
4-0 
99-9 
66-5 
•9 
18-9 
3*6 
1-3 
•4 
•2 
4-8 
4-5 
lOOT 
65 3 
1-2 
20-2 
5-6 
1*2 
•2 
2-1 
2-5 
1-2 
99-4 
2 * 4*4 
14 rocks 
69-7 
1 
1-2 
16-5 
2-1 
1-3 
•3 
1-4 
2-8 
4-6 
99-9 
2-66 
. 
v 
^ 
v. — 
± 1*7 
± 1-5 
± 1*2 
±•8 
± 1-3 
± 6-5 
( 2 - 38 ) 
9 
a a b 
a a a 
76-3 
•3 
14-2 
1-2 
5-0 
39 
100-9 
76*0 
•3 
13-3 
1-7 
•3 
•8 
5 3 
3 8 
101-5 
... 
75-8 
•4 
13*2 
11 
•4 
•9 
37 
5-4 
100-9 
... 
75*6 
•7 
12*9 
34 
7*1 
99-7 
... 
