92 
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 . 
1 
a a a a a a 
85-7 
1-1 
7-7 
•3 
•4 
•5 
4-0 
•2 
999 
2-57 
833 
•8 
8-4 
•1 *3 
•1 
•7 
5*8 
99-5 
2-63 
82-5 
*2 
1*3 
8-4 
2-5 
•3 
1-7 
2*4 
•8 
100-0 
2-65 
80-6 
1*1 
9-9 
2*1 
*8 
2-2 
•4 
2-4 
99-5 
2-65 
80-5 
1-4 
8-3 
3*4 1*0 
1*2 
2T 
1-9 
99-8 
2-63 
80-4 
2-0 
11*1 
1-8 
•6 
•7 
1-8 
2-5 
100-7 
2-68 
79-9 
7*4 
5*6 
3-4 
2-5 
•3 
1-2 
100-4 
78-7 
•6 
9-0 
2*2 2-0 
•4 
•3 
5-5 
•6 
99-3 
78*0 
3’6 
11-2 
1-3 
•9 
4-9 
99-9 
73-9 
8*5 
12-0 
1*1 
•3 
1*1 
1*6 
2-3 
100-7 
( 2 : 30 ) 
10 rocks 
80-4 
2*8 
9-2 
] *5 -6 
•3 
IT 
2-4 
1*8 
ioo-o 
264 
± 1*9 
± 1*9 
± 1-2 
"±•7 
± 1T 
± 6-8 
( 2 - 30 ) 
2 
a a a 
a a b 
80-6 
2-0 
11-3 
•3 1-4 
1-0 
•5 
•7 
30 
1007 
2-55 
78-7 
2-0 
10-7 
*8 1-0 
1-5 
•3 
2-0 
1-9 
98-8 
2-69 
78-3 
•7 -1 
•9 
10-0 
1*8 1*9 
•9 
1*7 
2-7 
1*4 
100-4 
78-1 
•8 
13*6 
1-1 
*7 
2-0 
•2 
2-7 
99-2 
78-0 
10-0 
2*0 1-6 
no 
6-0 
98-6 
77-6 
•6 -1 
1-5 
12-7 
•7 
•2 
T 
2-6 
4-0 
100-1 
2 : 51 
77*3 
•9 
10*0 
2-6 1*4 
•5 
2*3 
2T 
2-4 
99-4 
2-67 
77'2 
1*1 
6-5 
5*8 
•6 
1-8 
30 
3*7 
99-8 
2-64 
76-9 
2*0 
12-9 
T2 
1*0 
•7 
•7 
4-3 
99-7 
2-49 
76-8 
•7 
13-7 
1-8 -3 
•5 
2-8 
1*6 
2T 
100-3 
76-1 
2-7 
14-8 
1*5 
1-0 
T 
•4 
33 
99-7 
2-70 
73-6 
5*6 
10*0 
37 
•2 
1-9 
2*4 
33 
100-7 
12 rocks 
77-4 
•1 
1-7 
11*3 
1-9 *7 
•7 
1*3 
1*5 
3-2 
99-8 
2-61 
y 
±i*o 
± 1*8 
± 1-3 
±•7 
± 1 T 
(± 5 - 9 ) 
3 
a a a 
aba 
78-4 
•6 
10-8 
1*3 -5 
•4 
2*7 
5-5 
100-2 
2-61 
77-8 
*6 
13*2 
•2 -7 
5T 
2T 
99-7 
2-63 
77-6 
•2 
•2 
11*9 
•6 *9 
*3 
3-8 
5*0 
100-5 
773 
1*4 
11*2 
1*7 
•2 
3T 
4-6 
99-5 
77*3 
•3 
•7 
11-6 
1-6 -8 
•8 
•6 
5-8 
1-0 
100-5 
77*2 
•6 
( 12 - 0 - 
2 * 6 ) 
•4 
7-6 
•2 
100-6 
not 
given 
76-9 
•7 
12-5 
•5 1-1 
•3 
•8 
3-2 
3-5 
99-4 
76-9 
•8 • 
31*6 
•7 2-6 
•6 
•9 
5-6 
•7 
100-4 
76*3 
•3 
•5 
11*6 
2*4 -3 
•1 
•6 
5-5 
2-8 
100-4 
76-3 
•4 
•7 
12T 
1*1 ’9 
•1 
•7 
2-9 
4-5 
99-6 
76-2 
1-1 
10-6 
1-2 3*4 
•9 
•9 
5 3 
•6 
100-4 
764 
•1 
•9 
11-4 
2*2 
•1 
•6 
7 3 
1-2 
99*8 
2*61 
