92 Proceedings of the Royal Society of Edinburgh. [S( 
List of 1000 Rocks 
Group. 
Si0 2 . 
Ti0 2 . P 2 0 6 
H 2 0. 
A1 2 0 3 . 
Fe 2 0 
3- FeO 
MgO. 
CaO. 
Na 2 0. 
K 2 0. 
Total. 
Sp. Gr. 
1 
o a 
aaa 
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 
■2 
1*3 
8-4 
2-5 
•3 
1-7 
2-4 
•8 
100-0 
2-65 
8U-6 
1*1 
9-9 
2-1 
•8 
2-2 
■4 
2-4 
2-65 
80-5 
1*4 
34 
1*0 
1-2 
21 
1-9 
99-8 
2-63 
80-4 
2-0 
11-1 
•7 
1-8 
2-5 
100-7 
2-68 
79-9 
5-6 
3-4 
2-5 
•3 
1-2 
100-4 
78-7 
•6 
90 
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 
ri 
1-6 
2*3 
100-7 
(2*30) 
10 rocks 
80-4 
2*8 
9-2 
1-5 -6 
•3 11 
2-4 
I' 8 . 
100-0 
2-64 
±i-9 
±1-9 
a-2 
± 
•7 
±1 
1 
±6-8 
(2-30) 
2 
a a a 
a a b 
806 
2-0 
11-3 
•3 
1*4 
1*0 
•5 
•7 
30 
100 7 ; 
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 
78-0 
10-0 
2-0 
1*6 
1-0 
98-6 
77-6 
•6 -1 
1-5 
12-7 
•7 
•2 
•1 
2-6 
4-0 
100-1 
2*51 
773 
•9 
10-0 
2-6 
1-4 
•5 
2-3 
21 
2-4 
99-4 
2-67 
77*2 
1-1 
65 
5-8 
•6 
1-8 
30 
37 
99-8 
2-64 
76-9 
2-0 
12-9 
1-2 
1*0 
•7 
•7 • 
4-3 
99-7 
2 *49 
76-8 
•7 
13-7 
1-8 
•3 
•5 
2-8 
1*6 
21 
100-3 
76 - l 
2-7 
14-8 
l'O 
■1 
•4 
33 
99-7 
2*70 
73-6 
6-6 
10-0 
37 
•2 
1*9 
2*4 
3*3 
100-7 
12 rocks 
77-4 
•1 
1-7 
11*3 
1-9 
•7 
1*3 
1-5 
32 
99-8 
2-61 
±i-o 
±1*8 
=fc 
13 
±- 
7 
±1 
1 
(±5-9) 
3 
a a a 
a b a 
78-4 
•6 
10-8 
1*3 
•5 
•4 
2-7 
5*5 
100-2 
2-61 
77‘8 
•6 
13-2 
■2 
•7 
61 
21 
997 
2-63 
77'6 
•2 
•2 
11*9 
•6 
•9 
•3 
38 
5 0 
100-5 
773 
1*4 
11-2 
1‘7 
■2 
31 
4-6 
77'3 
*3 
•7 
11-6 
1-6 
•8 
*8 
•6 
5-8 
10 
100-5 
77-2 
•6 
(12-0- 
2-6) 
•4 
76 
•2 
100-6 
not 
76-9 
■7 
12-5 
. 5 
1-1 
•3 
•8 
3-2 
3-5 
99-4 
given 
76-9 
•8 
1 1-6 
■7 
2-6 
■6 
•9 
5-6 
•7 
100-4 
76*3 
•3 
■5 
11-6 
2-4 
*3 
•6 
5-5 
2-8 
100-4 
763 
*4 
•7 
12-1 
1-1 
•9 
•1 
2-9 
45 
99-6 
76-2 
1*1 
10*6 
1*2 
3-4 
•9 
•9 
5*3 
•6 
100-4 
76*1 
•1 
•9 
11-4 
2-2 
•1 
•6 
73 
1-2 
2*61 
1907-8.] 
Classification of Igneous Rocks. 
93 
arranged under 64 Groups. 
N. Jahrb., 1901, suppl. 14, p. 38. 
N. Jahrb., 1901, suppl. 14, p. 38. 
N. Jahrb., suppl. 1893, p. 568. 
Q. Journ., 1900, p. 679. 
Q. Journ., 1900, p. 679. 
(). Journ., 1895, p. 141. 
Z. Ges. Nw. Halle, vi., p. 70, 1887. 
N. Jahrb., 1901, suppl. 14, p. 38. 
Q. Journ., 1893, p. 558. 
Zeitsch. d. d. geol. Ges., part i., 1867-8, xx., p. 539. 
Porphyroid. 
Porphyroid. 
Quartz keratophyre. 
Felsite. 
Felsite. 
Greisen. 
Pitch stone. 
Porphyroid. 
Felsite. 
Pitch stone. 
Harz. 
Westphalia. 
Co. Waterford. 
Co. Waterford. 
Skiddaw. 
Persia. 
Harz. 
Meissen. 
Q. Journ., 1*883, p. 297. 
N. Jahrb., 1901, suppl. 14, p. 38. 
G. H. Williams, 15, A.R.U.S.G.S., p. 670, 1895. 
Q. Journ., 1899, p. 763. 
Prestwich, i., p. 37. 
Q. Journ., 1899, p. 467. 
C. Chelius, Erl. G. Kte. Hesse, I. El. Rossdorf, 
p. 35, 1886. 
Q. Journ., 1900, p. 679. 
A. Geikie, p. 135, edit. 1882. 
L. Milcli, N t J.B.B., xii., p. 180, 1899. 
O. Miigge, N.J.B.B. , viii., p. 667, 1893. 
Duparc, Pearce, and Ritter, Mem. Soo. Phys. 
Gen., xxxiii., 2, p. 115, 1900. 
Felsite tuff. 
Porphyroid. 
Granite gneiss. 
Felsite, perlitic. 
Obsidian. 
Rhyolite. 
Granite. 
Felsite, pale green. 
Quartz porphyry. 
Granite. 
Keratophyre tuff. 
Liparile. 
St Davids. 
Harz. 
Maryland. 
Co. Waterford. 
Mexico. 
Omahu, N. Zealand. 
Hessen. 
Co. Waterford. 
Meissen, Saxony. 
Westphalia. 
N. Jahrb,, 1904, vol. ii., p. 407. 
Q. Journ., 1895, p. 319. 
Whitman Cross, Table XIV. 
G. O. Smith, Geol. of Fox Is. In. Dies., 1896, p. 51. 
P. J. Holmquist, Afh. Sver. G. Und., No. 181, 
p. 83, 1899. 
Hatch, Petrology, p. 138. 
K. FuIFerer, Mt. Bad. G. La., ii., p. 41, 1893. 
Q. Journ., 1884, p. 528. 
F. Bascon 1,-B.U.S.G.S., 150, p. 348, 1898. 
N. Jahrb., 1900, voL ii, p. 221. 
Q. Journ., 1884, p. 528. 
N. Jahrb., 1893, vol. ii., p. 100. 
Quartz ljorphyry. 
Soda felsite. 
Granite. 
Aporhyolite. 
Granite. 
Rhyolite. 
Granite. 
Dimetian. 
Aporhyolite. 
Granite porphyry. 
Dimetian, two analyses. 
Quartz porphyry. 
N. Hampshire. 
Co. Wicklow. 
Cape Anne, Mass. 
Maine. 
Sweden. 
Co. Wicklow. 
Baden. 
Pembrokeshire. 
Pennsylvania. 
Sundswall. 
St Davids. 
Klinzerberg. 
