LIST ¢ OF BOOKS OFFERED FOR SALE 
AT THE NET PRICES AFFIXED BY 
DULAU & CO., Era 37 ——) SQUARE, LONDON, W. 
BAKER (E. A.) AND BALCH (H. E.). The Netherworld of Mendip. 
Hixplorations in the great caves of Somerset, Yorkshire, Derby, and 
elsewhere. London, 1907. S8vo. Illustrated. Cloth. 7s. 6d. 
BATHER (F. A.). Studies in Edrioasteroidea, I-IX. Reprinted, with — 
-additions, from the Geological Magazine, 1898-1915. London, 1915. 
pp. 136, 8vo, and 13 plates. 10s. 
BAYLEY (W. S.). Minerals and Rocks: the Elements of Mineralogy and 
Lithology for the use of Students in General Geology. London, 1916. 
pp. viii + 227. 8vo. Illustrated. Cloth. 6s. 
BEYSCHLAG (F.), VOGT (J. H. L.), anp KRUSCH (P). The Deposits 
of the useful Minerals and Rocks, their Origin, Form, and Content. 
Translated by E. J. Truscott. Tuondon, 1914. (3 vols.) S8vo. Vol. i, 
with 291 illustrations. Cloth. 18s. : 
Vol. ii. 1916. With 176 illustrations. Cloth. £1. 
CRAMPTON (C. B.) AND CARRUTHERS (R. G.). The Geology of Caithness. 
Edinburgh (Geol. Sury.), 1914. 8vo. Illustrated. 4s. 
DANA. Third Appendix to the Sixth Edition of Dana’s System of 
Mineralogy, by William E. Ford. Completing the Work to 1915. New 
“York, 1915. “pp. xiii + 87. -8vo. Cloth: 6s. 6d: 
/ ECKEL (E. C.). Iron Ores: their occurrence, valuation, and control. New 
York, 1914. Illustrated. 8vo. Cloth. - 17s. 
FARRINGTON (O. C.). Meteorites: their Structure, Composition, and 
Terrestrial Relations. Chicago, 1915. pp. x + 333. 8vo. Illustrated. 
Cloth. 8s. 6d. 
iS FINLAY (G. I.). Introduction to the Study of Igneous Rocks. London, 1913. 
pp. 228, crown 8yo, with 3 coloured plates and numerous illustrations. 
Flexible leather. 8s. 6d. 
GREGORY (J. W.). Geology of To-day. A popular introduction in simple 
language. London,1915. pp. 328, 8vo, with 24 plates and illustrations. 
pe eC loi. Sos s, 
HAGER (D.). Practical Oil Geology. New York, 1915. pp.150. Crown 8vo. 
Illustrated. Cloth. 8s. 6d. 
HOWE (H. M.). The Metallography of Steel and Cast Iron. New York, 
1916. pp. 641, 8vo, with 45 plates. Cloth. £2 2s. 
IDDINGS (J.). The Problems of Voleanism. (Silliman Memorial Lectures.) 
New Haven, 1914. Roy. 8yo. With 86 illustrations and chart. Cloth. 
£1 1s. 
- JOLY (J.). The Birth-time of the World, and other scientific essays. London, 
1915. S8vo. With 28 plates and 15 illustrations in text. Cloth. 10s. 6d. 
KEITH (A.). The Antiquity of Man. London, 1915. 8yo. With 189 
illustrations. Cloth. 10s. 6d. — 
LAKE (P.). Physical Geography. Cambridge, 1915. S8vo. With 20 plates. 
Cloth. 7s. 6d. 
LECONT (J.). Elements of Geology. 5th ed., revised and enlarged. With 
new plates and illustrations. New York, 1915. S8vo. Cloth. 18s. 
LEITH (C. K.). Structural Geology. London, 1914. pp. 169, Svo, with 
68 text-illustrations. Cloth. 6s. 6d. 
_ Its purpose is the study and interpretation of rock-structures, not for 
themselyes, but for the light they may throw on stratigraphic problems, 
on economic geology, on the causes underlying the general configuration 
of the earth, and on the earth’s history. 
—-— AND MEAD (W. J.). Metamorphic Geology. A Textbook. New 
York, 1915. 8vo. Illustrated. Cloth. 12s. 
