1907-8.] 
Classification of Igneous Eocks. 
93 
ARRANGED UNDER 64 GROUPS. 
N. Jahrb ., 1901, suppl. 14, p. 38. 
Porphyroid. 
Harz. 
N. Jahrb., 1901, suppl. 14, p. 38. 
Porphyroid. 
Harz. 
N. Jahrb., suppl. 1893, p. 568. 
Quartz keratophyre. 
W estphalia. 
Q. Journ., 1900, p. 679. 
Felsite. 
Co. Waterford. 
Q. Journ., 1900, p. 679. 
Felsite. 
Co. Waterford. 
Q. Journ., 1895, p. 141. 
Greisen. 
Skiddaw. 
Z. Ges. Nw. Halle, vi., p. 70, 1887. 
Pitch stone. 
Persia. 
N. Jahrb., 1901, suppl. 14, p. 38. 
Porphyroid. 
Harz. 
Q. Journ., 1893, p. 558. 
Zeilsch. d. d. geol. Ges., part i., 1867-8, xx., p. 539. 
Felsite. 
Arran. 
Pitch stone. 
Meissen. 
Q. Journ., 1*883, p. 297. 
Felsite tuff. 
St Davids. 
N. Jahrb., 1901, suppl. 14, p. 38. 
G. H. Williams, 15, A.R. U.S.G.S., p. 670, 1895. 
Porphyroid. 
Harz. 
Granite gneiss. 
Maryland. 
Q. Journ., 1899, p. 763. 
Felsite, perlitic. 
Co. Waterford. 
Prestwich, i., p. 37. 
Obsidian. 
Mexico. 
Q. Journ., 1899, p. 467. 
Rhyolite. 
Omahu, N. Zealand. 
C. Chelius, Erl. G. Kte. Hesse, I. Bl. Rossdorf, 
Granite. 
Hessen. 
p. 35, 1886. 
Q. Journ., 1900, p. 679. 
Felsite, pale green. 
Co. Waterford. 
A. Geikie, p. 135, edit. 1882. 
Quartz porphyry. 
Meissen, Saxony. 
L. Milch, N.J.B.B. , xii., p. 180, 1899. 
Granite. 
Silesia. 
0. Miigge, N.J.B.B ., viii., p. 667, 1893. 
Keratophyre tuff. 
Westphalia. 
Duparc, Pearce, and Ritter, Mem. Soc. Phys. 
Liparite. 
Algeria. 
Gen., xxxiii., 2, p. 115, 1900. 
N. Jahrb., 1904, vol. ii., p. 407. 
Quartz porphyry. 
N. Hampshire. 
Q. Journ., 1895, p. 319. 
Whitman Cross, Table XIY. 
Soda felsite. 
Co. Wicklow. 
Granite. 
Cape Anne, Mass. 
G. 0. Smith, Geol. of Fox Is. In. Diss., 1896, p. 51. 
P. J. Holmquist, Afh. Sver. G. Und ., No. 181, 
Aporhyolite. 
Maine. 
Granite. 
Sweden. 
p. 83, 1899. 
Hatch, Petrology , p. 138. 
Rhyolite. 
Co. Wicklow. 
K. Fufferer, Mt. Bad. G. La., ii., p. 41, 1893. 
Granite. 
Baden. 
Q. Journ., 1884, p. 528. 
Dimetian. 
Pembrokeshire. 
F. Bascom ,*B.U.S.G.S., 150, p. 348, 1898. 
Aporhyolite. 
Pennsylvania. 
N. Jahrb., 1900, vol. ii., p. 221. 
Granite porphyry. 
Sundswall. 
Q. Journ., 1884, p. 528. 
Dimetian, two analyses. 
St Davids. 
N. Jahrb., 1893, vol. ii., p. 100. 
Quartz porphyry. 
Klinzerberg. 
