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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. 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. 8vo. Illustrated. New York, 1921. £1 4s. 
DAVIES (A. M.). An Introduction to Paleontology. Illustrated. 8vo. 
Cloth. 1920. 12s. 6d. 
DAVY (W. M.) AnD Farnuam (C. M.). Microscopic Examination of the Ore 
Minerals. pp. ix +154. 8vo. Cloth. New York, 1920. 16s. 
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. 8vo. Cloth. 8s. 6d. 
The Rift Valleys and Geology of Hast Africa. With many maps 
and illustrations. pp. 479. S8vo. 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. vo. With 16 illustrations. Cloth. London, 1920. 6s. 6d. 
HOLMES (A.). Nomenclature of Petrology. pp. 284+ vii. 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 Ils. 6d. 
HOMEN (T.). Hast Carelia and Kola Lapmark. Described by Finnish 
Scientists and Philologists. London, 1921. pp. xiii + 264. 8vo. with 
13 maps and 61 illustrations. Cloth. £1 Is. 
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. S8vo. Cloth. 2s. 6d. net. 
KRAUS (E. H.) anD HUNT (W. F.). Mineralogy: an introduction to the 
study of Minerals and Crystals. pp. xiv + 561. Svo. Cloth. New 
Worle, iGPANs  esll 7G 2 
LAKE (P.) anD RASTALL (R. H.). Text-book of Geology. Third edition. 
London, 1920. S8vo. Cloth. £1 Is. 
LEITH (C. K.). The Economic Aspect of Geology. pp. xiii+ 457. S8vo. 
Cloth. New York, 1921. £1 10s. 
and MEAD (W. J.). Metamorphic Geology. A Textbook. 8vo. 
Illustrated. Cloth. New York, 1915. £1. 
MARTIN (BE. A.). Life in a Sussex Windmill, with some amenities of the 
South Downs. 2nd edition. pp. vilit+- 118. Seven plates and illustra- 
tions in the text. 8vo. Cloth. London, 1921. 6s. net. 
REED (F.B.C.). The Geology of the British Empire. pp.480. 8vo. With 
12 folding maps and 13 maps and sections in the text. Cloth. London, 
NGPA, 52. 
RUTLEY (F.). Elements of Mineralogy. 20th ed. Revised with an intro- 
duction by G. T. Holloway. pp. xxiit+ 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 8yvo. 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. 
2vols. Svo. With 26 plates and text illustrations. £1 10s. 
