Proceedings of the Eoyal Society of Edinburgh. [Sess. 
List op 1000 Rooks 
Group. 
Si0 2 . 
TiO a . P 2 0 6 . 
h 2 o. 
A1 2 0 3 . 
Fc 2 0 3 . 
FeO. 
MgO. 
CaO. 
Na 2 0. 
k 2 o. 
Total. 
Sp.Gr. 
>4 
•3 
56 
4-0 
100-0 
2*58 
■5 
1*5 
■3 
1-3 
40 
4-3 
100-2 
1-1 
•4 
•5 
4-4 
4-2 
100-0 
•8 
4-7 
39 
100-2 
73-0 
1-3 
152 
1-9 
10 
•6 
34 
4-1 
100-5 
12-8 
2-6 
1*9 
•3 
•6 
3-2 
5*2 
100-3 
« 2-0 
•4 
•1 
4-4 
\00-2 
72-1 
1-1 
14-8 
2-2 
•3 
1-6 
2-8 
5*1 
100-0 
•5 
3-2 
4‘1 
1*1 
101-9 
, I 
•8 
■3 
1*3 
63 
100-1 
2-71 
14-4 
3-4 
•6 
1-5 
31 
4-1 
99-8 
700 
1*0 
1-3 
133 
49 
•7 
1-8 
33 
35 
99-8 
693 
1-2 
17-3 
2' 
5 
1-2 
38 
4-3 
1*7 
99-9 
- j 
RQ-n 
1-0 
4-6 
3*9 
100-0 
685 
26 
14-7 
39 
•3 
39 
23 
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 
± i-l 
=tl-0 
.1 
* 
■9 
(*4-9) 
8 
aaa 
bbb 
73*7 
12-4 
4-2 
•9 
2-2 
6-6 
100-0 
72-2 
1-5 
14-5 
1-8 
•9 
•9 
1-9 
6-1 
99-8 
2*62 I 
72-1 
•5 
15-8 
2-7 
1-3 
2-0 
31 
3-1 
100-6 
71-4 
1-7 
15-4 
•3 
2-3 
•2 
•5 
2-8 
5*5 
100-1 
2*65 1 
70-7 
1-2 
162 
1-5 
•5 
•6 
*5 
8-7 
99-8 
2-62 1 
70'6 
1-6 
17-6 
1*7 
20 
•8 
5*1 
996 
(2-29) Q 
69-6 
17-4 
1-0 
2*0 
•2 
1-4 
35 
4-1 
999 
2-72 r 
693 
17'4 
1-3 
•3 
23 
36 
• 2-8 
1 98-0 
69'2 
•6 
17-5 
11 
3:1 
10 
2-9 
2-7 
30 
1013 
68-6 
34 
164 
•7 
1-5 
•1 
1-8 
2-8 
4-7 
100-0 
2*42 
68-4 
1-6 -3 
1-6 
13-8 
2-6 
2-7 
•7 
•7 
36 
4-5 
100-5 
1-9 
16-9 
30 
1-5 
4-3 
99-9 
665 
•9 
18-9 
3-6 
1-3 
•4 
•2 
4-8 
4-5 
100-1 
65-3 
1-2 
202 
5-6 
1-2 
•2 
2-1 
2-5 
1-2 
99-4 
2-44 |] 
14 rocks 
69-7 
■i 
1 1-2 
16-5 
2-1 
1-3 
•3 
1-4 
2-8 
4-6 
99-9 
2-66 
±1-5 
* 
Ti 
: *8 
* 
1*3 
±6-5 
(2-38) 1 
9 
76-3 
•3 
14-2 
1-2 
5-0 
39 
100-9 
... 
760 
•3 
133 
1-7 
•3 
•8 
5-3 
3-8 
101-5 
1 
75-8 
*4 
132 
11 
•4 
•9 
37 
5 4 
100-9 
75*6 
•7 
12-9 
3 4 
7-1 
99-7 
1 
1907-8.] 
Classification of Igneous Eocks. 
G. T. Prior, Min. Mag. xii., p. 262, 190 
Q. Journ., 1902, p. 666. 
Q. Journ., 1902, p. 666. 
N. Jahrb., 1905, vol. i., p. 437. 
C. Barrois, Guide , Exc. viii., Cong. G., 
21, 1900. 
N. Jahrb., 1900, vol. ii., p. 221. 
N. Jahrb., 1905, vol. i., p. 247. 
A. Geikie, p. 157, third edit. 
N. Jahrb., 1895, vol. ii., p. 82. 
. xlvii 
U. S. Grant, 21, A.R.G.Nh.S. Minn., p. 43, 
1893. 
Q. Journ., 1901, p. 36. 
Duparc, Pearce, and Ritter, M. Soc. Ph. Genev. 
xxxiii., No. 2, p. 59, 1900. 
Merrill, p. 132. 
iV. Jahrb., 1905, vol ii., p. 382. 
W. Cross, B. U.S.G.S., 148, p. 179, 1897. 
E. Haworth, A.R.Mo.G.S., viii., p. 181, 1895. 
C. W. Schmidt, Z.D.G.G., xxxvii., p. 744, 1885. 
iV. Jahrb., 1905, vol. i., p. 247. 
iV. Jahrb., 1893, voL i., p. 285. 
N. Jahrb., 1906, vol. i., \ 
Q. Journ., 1902, p. 666. 
Buparc and Mrazec, M. 
No. 1 , p. 107, 1898. 
N. Jahrb., 1901, vol. ii., 
Phys. Gen., xxxiii. 
Grorudite. 
Rhyolite obsidian. 
Granular felsite. 
Quartz costonite. 
Aplite. 
Felsite porphyry. 
Liparite, mean of 6 and 7. 
Granite, mean of twelve 
localities. 
Poqjhyry. 
Quartz keratophyre. 
Granite. 
Granite. 
Granite. 
Granite. 
Eurite(fine-grainedElvan). 
Granite. 
Granitite. 
Rhyolite. 
Granite. 
Liparite. 
Liparite. 
Andesite. 
Granite. 
Rhyolite. 
Quartz porphyry. 
Abyssinia. 
Medicine Lake. 
Co. Wicklow. 
Madagascar. 
Brittany. 
Leinster. 
Harz. 
Newry, Co. Down. 
Syene, Egypt. 
Qu^rigut, Pyrenees. 
Cornwall. 
Chywoon, Cornwall. 
Hungary. 
Lamorna, Cornwall. 
N. Carolina. 
Brix. 
Colorado. 
Iceland. 
Somali Desert. 
Cabo de Gata. 
Campo, Elba. 
Euganean Hills, Italy. 
Mont Blanc. 
Silfpickarehald. 
