Messrs. DULAU & CO., Ltd. 
(for over a century at 37 Soho Square) 
34-36 Margaret Street, Cavendish Square, 
LONDON, W.1 
(close to Oxford Circus). 
A large and constantly changing Stock of 
NATURAL HISTORY BOOKS 
both New and Second-hand. 
NEWLY PUBLISHED CATALOGUE No. 89 
of Works on 
ENTOMOLOGY, ORNITHOLOGY, 
GENERAL ZOOLOGY and BOTANY 
sent post free on application. 
LIBRARIES PURCHASED, AT ANY DISTANCE. 
Telephone—MAYFAIR 3809. 
OSWALD (Fenix), D.Sc, F.G.S. A Geological Map of the 
Caucasus. With explanatory text. Compiled from the latest 
sources. Seale 1: 1,000,000 (15°78 miles = linch). 15s. The geological 
formations and the igneous rocks are clearly displayed in twenty 
different colours. The glaciers are also indicated. All heights are 
given in English feet, and the latest railways have been inserted. 
The pamphlet of explanatory text gives a brief account of the main 
physical divisions of the Caucasus, followed by a detailed description 
of the successive geological horizons with their characteristic fossils. 
Special care has been taken to indicate the exact position in the 
geological series at which petroleum occurs in the Caucasian oil-fields. 
TABLE OF BRITISH STRATA. 
COMPILED BY 
PUSINURNC WOOIWMVNRID., IEILID.5 |S.lRoS, IS. S.- 
HORAGE By WOODWARD. oR) Gus: 
5/- net. Folded in book form, 7/6 net. 
London: DULAU & CO., Ltd. 
34-36 Margaret Street, Cavendish Square, WwW. 1. 
