LIST OF BOOKS OFFERED FOR SALE 
AT THE NET PRICES AFFIXED BY 
DULAU & CO., LTD., 34-36 MARGARET STREET, 
CAVENDISH SQUARE, LONDON, W. 1. 
ARBER (E. A. N.). Devonian Floras. A study of the origin of Cormophyta. 
With a preface by D. H. Scorr. S8vo. Illustrated. Cloth Cambridge. 
17s. 6d. ; 
BURKITT (M.C.). Prehistory. A study of Early Cultures in Europe and 
the Mediterranean Basin. With a short preface by L’Abbe H. Breuil. 
pp. xvit438. Roy. 8vo. With 47 plates. Cloth. Cambridge, 1921. £115s. 
COX (G. H.), DAKE (C. L.), anD MUILENBURG (G. A.). Field Methods 
in Petroleum Geology. pp. 305. 8vo. Illustrated. New York, 1921. 
£1 4s. 
CROOK (T.). Economic Mineralogy. A practical guide to the study of Useful 
Minerals. pp. xi+492. 8vo. Illustrated. Cloth. London, 1921. £1 5s. 
DAVIES (A. M.). An Introduction to Paleontology. Illustrated. 8vo. 
Cloth. 1920: 12s. 6d. 
DAVISON (C.). Manualof Seismology. pp. xii+256. 8vo. With 100 figs. 
in text. Cloth. Cambridge, 1921. 21s. 
ELLES (G. L.). The Study of Geological Maps. Royal 8vo. Cloth. 
Cambridge, 1921. 12s. 
EMERSON (F. V.). Agricultural Geology. New York, 1920.  8vo. 
Illustrated. Cloth. 16s. 6d. 
EMMONS (W. H.). Geology of Petroleum. pp. 624. 8yvo. Illustrated. 
New York, 1921. £1 16s. 
GREGORY (J. W.). Nature and Origin of Fiords. With diagrams and 
illustrations. London, 1913. 8vo. Cloth. 8s. 6d. 
HARKER (A.). Petrology for Students. JFifth edition. Crown 8vo. Cloth. 
Cambridge, 1919: 8s. 6d. 
HAWKINS (H. L.). Invertebrate Paleontology, and Introduction to the 
Study of Fossils. S8vo. With 16 illustrations. Cloth. London, 1920. 
6s. 6d. 
HOLMES (A.). Nomenclature of Petrology. pp. 284+ viii. Crown 8vo. 
Cloth. London, 1920. 12s. 6d. net. 
Petrographic Methods and Calculations, with some Examples 
of Results Achieved. pp. xx+516. 8vo. Cloth. London, 1921. £1 11s. 6d. 
HUME (W. F.). The Rift Valleys and Geology of Eastern Sinai. 8vo. 
Cloth. 1901. Qs. 
JUKES-BROWNE (A. J,). The Hills and Valleys of Torquay: a Study in 
Valley Development and an explanation of Local Scenery. 1907. 
Seven maps and diagrams. 8yvo. Cloth. 2s. 6d. net. 
LAKE (P.) AND RASTALL (R. H.). Text-book of Geology. Third edition. 
London, 1920. 8vo. Cloth. £1 1s. ; 
LEITH (C. K.) anD MEAD (W. J.). Metamorphic Geology. A Textbook. 
8vo. Illustrated. Cloth. New York, 1915. £1. 
POSTLETHWAITE (J.). Mines and Mining in the (English) Lake District. 
Third edition. 8vo. Illustrated. Cloth. Whitehaven, 1913. 5s. 
REED (F.R.C.). The Geology of the British Empire. pp.480. 8vo. With 
12 folding maps and 13 maps and sections in the text. Cloth. London, 
Geil, 490, 
RUTLEY (F.). Elements of Mineralogy. 20th ed. Revised with an 
introduction by G. T. Holloway. pp. xxii+394. Cr. 8vo. Illustrated. 
Cloth. 6s. 
TEALL (J. J. Harris), M.A., F.G.S. British Petrography: with special 
reference to the Igneous Rocks. With 47 plates. Royal 8vo. Cloth. 
£3 3s. net. 
VAN DEN BROECK (E.), MARTEL (E. A.), AND RAHIR (Epm.). Les 
Cavernes et les Riviéres souterraines de la Belgique. Bruxelles, 1910. 
2 vols. 8vo. With 26 plates and text illustrations. Boards. £1 10s. 
