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 (EK. A. N.). Devonian Floras. A study of the origin of Cormophyta. 
With a preface by D. H. Scorr. 8vo. Illustrated. Cloth. Cambridge. 
17s. 6d. 
BEILBY (G.). Aggregation and Flow of Solids. Being the records of an 
experimental study of the Micro-Structures and Physical Properties of 
Solids in various states. 1900-1921. pp. xvi+ 256. 8vo. With 34 
plates. Cloth. London, 1921. £1. 
COX (G. H.), DAKE (C. L.), AnD MUILENBURG (G. A.). Field Methods 
in Petroleum Geology. pp. 305. S8vo. Illustrated. New York, 1921. 
£1 As. 
CROOK (T.). Economic Mineralogy. A practical guide to the study of Useful 
Minerals. pp. xit+492. 8vo. Illustrated. Cloth. London,1921. £1 5s. 
DAVIES (A. M.). An Introduction to Paleontology. Illustrated. 8vo. 
Cloth. 1920. 12s. 6d. 
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. 8vo. Illustrated. 
New York, 1921. £1 16s. 
GREGORY (J. W.). Nature and Origin of Fiords. With diagrams and 
illustrations. London, 1913. S8vo. Cloth. 8s. 6d. 
The Rift Valleys and Geology of East Africa. With many maps 
and illustrations. pp. 479. 8vo. Cloth. London, 1921. £1 12s. 
HARKER (A.). Petrology for Students. Fifth edition. Crown 8vo. Cloth. 
Cambridge, 1919. 8s. 6d. 
HAWKINS (H. L.). Invertebrate Paleontology, and Introduction to the 
Study of Fossils. 8vo. 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. 8yo. 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. 8vo. 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, 
19215 62% 
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, 1910v. 
2vols. 8vo. With 26 plates and text illustrations. £1 10s. 
