LIST OF BOOKS OFFERED FOR SALE 
AT THE NET PRICES AFFIXED BY 
DULAU & CO., LTD., 37 SOHO SQUARE, LONDON, W. 
BAKER (HE. A.) AND BALCH (H. E.). The Netherworld of Mendip. 
Explorations in the great caves of Somerset, Yorkshire, Derby, and 
elsewhere. London, 1907. S8yo. Illustrated. Cloth. 7s. 6d. 
BATHER (F. A.). Studies in Edrioasteroidea, I-IX. Reprinted, with 
additions, from the Geological Magazine, 1898-1915: London, 1915. 
8vo. 136 pages and 13 plates. 10s. 
BEYSCHLAG (F.), VOGT (J. H. L.), anD KRUSCH (P). The Deposits 
of the useful Minerals and Rocks, their Origin, Form, and Content. 
Translated by EH. J. Truscott. London, 1914. (3.vols.) Svo. Vol. i, 
with 291 illustrations. Cloth. 18s. 
Vol. ii. 1916. With 176 illustrations. Cloth. £1. 
CRAIG (E.H.C.). Oil Finding: an Introduction to the Geological Study 
of Petroleum. 2nded. London, 1914. S8vo. pp. 208. Cloth. 8s. 6d. 
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. 8vo. pp. xiii+87. Cloth. 6s. 6d. 
ECKEL (E. C.). Iron Ores: their occurrence, valuation, and control. New 
York, 1914. 8vo. Illustrated. Cloth. 17s. 
FARRINGTON (0. C.). Meteorites: their Structure, Composition, and 
Terrestrial Relations. Chicago, 1915. pp. x-+ 333. S8vo. Illustrated. 
Cloth. 8s. 6d. 
FINLAY (G. I.). Introduction to the Study of Igneous Rocks. London, 1913. 
_ Crown 8vo. pp. 228, with 3 coloured plates and numerous illustrations. 
Flexible leather. 8s. 6d. 
- GRABAU (A. W.). Principles of Stratigraphy. New York [1913]. 8vo. 
pp. 1217, with illustrations. Cloth. £1 13s. 6d. 
GREGORY (J. W.). Geology of To-day. A popular introduction in simple 
language. TLondon,1915. 8vo. pp. 328, with 24 plates and illustrations. 
Cloth. 5s. 
HAGER (D.). Practical Oil Geology. New York, 1915. Crown 8vo. pp,.150. 
Illustrated. Cloth. 8s. 6d. 
HUTCHINSON (H. G.). Life of Sir John Lubbock (Lord Avebury). London, 
1914. 2vols. 8vo. pp. 352, 344. £1 10s. 
IDDINGS (J.). The Problems of Volcanism. (Silliman Memorial Lectures.) 
New Haven, 1914. Roy. 8vo. With 86 illustrations and chart. Cloth. 
ee lellis: 
JOLY (J.). The Birth-time of the World, and other scientific essays. London, 
1915. 8vo. With 28 plates and 15 illustrations in text. Cloth. 10s. 6d. 
KEITH (A.). The Antiquity of Man. London, 1915. 8vo. With 189 
illustrations. Cloth. 10s. 6d. ' 
LAKE (P.). Physical Geography. Cambridge, 1915. Svo. With 20 plates. 
Cloth. 7s. 6d. 
LECONT (J.). Hlements of Geology. 5th ed., revised and enlarged. With 
new plates and illustrations. New York, 1915. 8vo. Cloth. 18s. 
LEITH (C. K.). Structural Geology. London, 1914. 8vo. pp. 169, with 
68 text-illustrations. Cloth. 6s. 6d.” 
Its purpose is the study and interpretation of rock-structures, not for 
themselves, 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. 
