100 Proceedings of the Royal Society of Edinburgh. [St 
List of 1000 Rocks 
Group. 
Si0 2 . 
Ti0 2 . P 2 O s . 
h 2 o. 
AljOj. 
Fe 2 0 3 . 
FeO. : 
MgO. 
CaO. : 
Na 2 0. 
K 2 0. 
Total. 
3p. Gr. 
9 
75-5 
•9 
11-2 
•4 
‘I 
•3 
•8 
30 
8-0 
100-1 
1-4 
'I 
1*3 
1*6 
8*1 
4*5 
100-6 
2-39 
1-8 
11 
1*6 
40 
4-5 
100-0 
■8 
•9 
4-6 
4-5 
1000 
1*8 
1-3 
1-2 
43 
3-9 
1000 
129 
1*1 
•8 
37 
50 
99 ’6 
2*64 
21 
4-3 
loor. 
1-2 
■9 
1*4 
3‘2 
2 6 
4-0 
100-0 
•1 
15-7 
1*5 
•3 
•9 
34 
4’8 
2-3 
100-3 
705 
1-2 
159 
1-0 
1-4 
1*6 
4*9 
2-7 
99-2 
14 rocks 
74-1 
•1 
*9 
12*9 
•7 
•5 
•7 1*4 
4*4 
4*6 J 
100-2 
2-64 
±1*4 
±1*6 
* 
L*2 
*1 
■1 
±5-9 
(2-39) 
10 
a a 6 
a ab 
•4 
130 
1-0 
1*8 
10 
3*5 
5 6 
99-6 
2-64 
73-0 
•1 
2-0 
13-7 
2-0 
11 
2*0 
1-5 
39 
1-5 
100-8 
2-69 
72-5 
11*5 
2-1 
2-7 
1*8 
3-4 
5 2 
991 
72-2 
1*1 
136 
1*3 
1-5 
1-5 
2-2 
2-7 
36 
99-7 
71-8 
•6 
16-0 
1-8 
1-8 
1-7 
35 
4-2 
101-4 
70-8 
•4 *1 
•6 
15-1 
1*0 
1-4 
•7 
32 
31 
36 
100-1 
1-4 
13-9 
3*4 
2-5 
1*5 
36 
100-1 
2'70 
70-1 
•7 *1 
•8 
151 
1*7 
1-2 
1-2 
26 
36 
2-8 
100-0 
69-8 
32 
14-2 
•1 
2-8 
■6 
1-7 
3*3 
4*5 
100-2 
69-4 
•1 
1*2 
14*3 
36 
2-4 
32 
2*7 
2*7 
996 
? 
69-4 
*2 
•3 
12-8 
1-1 
26 
•7 
31 
5-2 
100-2 
68-9 
1-6 
14-7 
•9 
2-2 
1*6 
3-0 
37 
28 
99-4 
2-67 
68-5 
23 
14-7 
•4 
3*3 
1-4 
2*8 
2-9 
4*1 
100-5 
13 rocks 
708 
•i 
1-2 
14-0 
ro_ 
2*0 
1*5 
2-5 
3*1 
3-8 
100-0 
2-67 
±•9 
±*5 
* 
1*0 
* 
ri 
±4-7 
11 
a a b 
aba 
72-9 
■6 
12-9 
30 
•4 
*9 
7*1 
30 
100-8 
72-7 
•5 
12-8 
2-6 
1*5 
*1 
•6 
65 
3-9 
101-2 
726 
•7 
14-8 
*9 
•2 
1*2 
49 
5-3 
1006 
723 
•4 
13-4 
1-1 
•7 
4-3 
56 
99-4 
2*64 
72-2 
•6 
•7 
14-8 
1*0 
•9 
•3 
•7 
4-2 
5*2 
100-6 
72-1 
*3 
14-9 
1*3 
1-3 
59 
99-8 
2-70 
716 
•7 
13*6 
2-4 
■2 
2*3 
5-6 
35 
2-67 
71-4 
1-5 
14-8 
1*7 
•7 
•6 
*1 
4-8 
52 
1006 
71-3 
■3 
•8 
139 
1-3 
1*2 
•5 
1*0 
33 
99-8 
71-1 
•3 -1 
•3 
15-9 
•6 
1*6 
•5 
2-7 
35 
100-6 
71*1 
1*0 
14-6 
1-7 
*2 
1*5 
33 
6-0 
99-3 
71*0 
•6 
13*8 
3*7 
■6 
|| 
5-2 
4-0 
100-0 
(2-40) 
Classification of Igneous Rocks. 
101 
L907-8.] 
continued. 
0 Nordenskjold, B.G. Inst. Un. Upsala , i., 
p. 216, 1894. 
G. F. Becker, M. xiii., U.S.G.S. , p. 159, 1888. 
Q. Jow 71., 1895, p. 141. 
N. Jahrb ., 1904, vol. ii., p. 403. 
Watt’s Dictionary of Ghem. 
Weed and Pirsson, B. U.S.G.S ., 139, p. 96, 1896. 
A. Lagorio, T.M.P.M. viii., p. 444, 1887. 
N. Jahrb., 1899, suppl. 12, p. 162. 
P. Marshall, Tr. N.Z. Inst., xxvL p. 379, 1894. 
A. Lagorio, Guide , Exc. vii., Gong. G. Int., 
Rhyolite (Halleflinta). 
Rhyolite obsidian. 
Skiddaw granite. 
Aplite. 
Aplitic granite. 
Obsidian. 
Granitite. 
Tridymite trachyte. 
Keratophyre. 
Sweden. 
Borak Lake. 
Whitegill. 
Atlanta, Georgia. 
£££ 
Ecuador. 
Querseifen. 
N. Zealand. 
Russia. 
N. Jahrb., 1904, vol. ii., p. 407. 
N. Jahrb., 1904, vol. ii., p. 223. 
Q. Journ ., 1893, p. 558. 
N. Jahrb., 1899, suppl. 12, p. 232. 
C. Barrois, Guide, Exc. viii., Gong. G. Int., vii., 
p. 21, 1900. 
H. W. Turner, 17, A.R. U.S.G.S., i., p. 702, 1896. 
N. Jahrb., 1901, suppl. 14, p. 38. 
J. B. Harrison, priv. contrib. 
N. O. Holst, Ahr. Sver. G. Und ., No. 110, 
p. 37, 1890. 
Merrill, p. 207. 
Q. Journ., 1906 (Dr Evans), p. 119. 
N. Jahrb., 1904, vol. i., p. 49. 
N. O. Holst, Abh. Sver. G. Und., No. 110, 
p. 37, 1890. 
Quartz porphyry. 
Quartz aiorite porphyrite. 
Porphyritic felsite. 
Granitite. 
Granite. 
Biotite granite. 
Porphyroid. 
Granitite gneiss. 
Rhyolite. 
Granite. 
Granite. 
Porphyry (dark). 
Rhyolite. 
N. Hampshire. 
Montenegro. 
Riesengebirge. 
Bretagne, France. 
Amador county. 
Harz. 
Br. Guiana. 
Sweden. 
Columbia. 
Madeira, S. America. 
Bohulibi. 
Sweden. 
N. Jahrb., 1902, vol. ii., p. 237. 
A. Renard, Challenger Reps. Pet. Oc. Islands , 
p. 52, 1889. 
jV. Jahrb., 1904, vol. ii., p. 403. 
•W. Jahrb., 1904, vol. ii., p. 406. 
N. Jahrb., 1900, vol.' ii., p. 221. 
Q. Journ., 1895, p. 178. 
Q. Journ., 1895, p. 129. 
H. S. Washington, J.G., vii., p. 293, 1899. 
W. Jahrb., vol. ii., p. 221. 
W. Jahrb., 1901, vol. i., p. 242. 
Q. Journ., 1895, p. 178. 
A. Qeikie, p. 141. 
Quartz keratophyre. 
Obsidian. 
Granite. 
Quartz porphyry. 
Quartz porphyry. 
Pot. soda felsite. 
Grajiophyre. 
Keratophyre. 
Rapakiwi porphyry. 
Biotite granite. 
Liparite. 
Obsidian. 
Massachusetts. 
Ascension Island. 
Atlanta. 
N. Hampshire. 
Storflasen. 
Carn Gelli, Fishguard. 
Carrockfell. 
Massachusetts. 
Rodon. 
Yosemite Valley. 
Island of Ponza. 
Average. 
