96 Proceedings of the Royal Society of Edinburgh. [Sess. 
List of 1000 Rocks 
Group. 
Si0 2 . 
Ti0 2 . r > 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. 
5 
75-2 
•8 
16-3 
•1 
•9 
3 9 
3-8 
100-8 
75-1 
1-3 
122 
1-6 
•1 
•9 
4T 
4-6 
99-9 
74-8 
•3 
•8 
13*8 
•4 
•3 
•1 
•2 
4 3 
4 '8 
99'8 
2-59 
74*8 
•2 
1*6 
12-6 
1-2 
•3 
3-6 
5T 
•2 
99-6 
73-2 
2-8 
13-4 
1-8 
•1 
1*5 
3-2 
4-7 
100-6 
73-1 
•6 -1 
w 
13*5 
2-6 
•1 
•2 
IT 
4-0 
3-2 
99-8 
2-51 
73-1 
•7 
13-4 
2-6 
1*0 
2-3 
3-9 
1-6 
98-6 
72-7 
2-9 
12-7 
1-9 
•2 
1-6 
36 
4T 
99-7 
72*1 
4*8 
13*3 
1*4 
•4 
IT 
36 
3-6 
100-2 
72-1 
4-2 
13-7 
•3 
•9 
•4 
1*4 
3*2 
33 
99 6 
(2-35) 
72-0 
2-7 
14-9 
•3 
•2 
•3 
•8 
4T 
4*2 
99-5 
71*8 
3*1 
14*8 
1-9 
*7 
4-9 
2 '4 
99-6 
71*6 
1*1 
16-9 
•3 
•9 
•6 
2*2 
4-7 
1-3 
99-6 
2-61 
70*5 
6-1 
13-4 
•4 
•9 
•5 
1*0 
4*0 
3 5 
100-5 
23 rocks 
74*2 
•1 
1*7 
13*7 
1-0 
•4 
4 -3 
IT 
4T 
3*5 
100-0 
2-60 
y 
±•9 
±1-0 
±•7 
±•7 
±^9 
(±4-2) 
(2-35) 
6 
a a a 
b a b 
77-6 
13-5 
1*2 
•4 
•2 
7T 
100-0 
75-6 
•5 
12*8 
1-9 
•4 
T 
3-0 
5 - 6 
99-9 
2 "63 
75-4 
*7 
13*2 
•8 
•6 
'2 
*4 , 
IT 
7-0 
99-4 
75*3 
1*5 
13-6 
23 
•2 
1-0 
3-0 
4T 
101-0 
2*53 
74-8 
1*8 
13-9 
1*7 
•5 
1-5 
1-5 
4-7 
100-0 
2-54 
74-7 
1*2 
16-2 
1-8 
*5 
•3 
1-3 
3-6 
99-6 
2-64 
74-1 
•3 
13-0 
2-6 
•3 
1*0 
3-8 
4-6 
99-9 
74-2 
*2 
2-0 
14-5 
1-3 
•7 
•2 
•3 
3*0 
37 
100-3 
74-2 
1 0 
13-2 
32 
•3 
1-5 
1-9 
5-4 
100-7 
74-0 
•1 
1-2 
13*1 
•7 
1*3 
•2 
•9 
3*5 
5*0 
100-0 
2*64 
73-6 
•6 
13-8 
•5 
2-4 
*7 
•6 
3*2 
4*3 
99-7 
2-66 
73*6 
T 
2-0 
13*4 
•6 
•8 
*3 
1-4 
35 
4*5 
100-3 
72*9 
•5 
1*2 
13-9 
1-9 
•9 
•5 
•7 
37 
37 
100-0 
72-8 
2*4 
13*8 
1-7 
•3 
1*2 
3*4 
4-4 
100-0 
(2*42) 
72-8 
1-1 
13-8 
3-3 
•6 
1*9 
4T 
3-0 
100-6 
2-64 
72-4 
1-1 
15*2 
1-8 
*7 
1-5 
2-0 
2T 
35 
100-3 
71-6 
1*9 
12-8 
1-6 
1*8 
IT 
3T 
2-7 
30 
99-7 
17 rocks 
74*2 
•1 
13-7 
1-3 
1-0 
•5 
IT 
y 
2-7 
4-6 
100-1 
2-61 
±1*0 
±•6 
±•6 
±'•8 
(±3-8) 
(2-42) 
7 
a a a 
. b b a 
74-7 
*5 
13-0 
2-1 
•8 
*3 
•7 
3-8 
8-8 
100-7 
2 57 
74*5 
•9 
14-9 
2-5 
•2 
•3 
35 
37 
100-5 
2*66 
73*9 
*4 -2 
12-3 
2*9 
1-6 
•3 
4-7 
4-6 
1009 
2-64 
73*7 
•6 
14*5 
•4 
1-5 
IT 
4*2 
4-4 
100-4 
2-69 
