_ JAMES SWIFT & S 
_ Manufacturers of Optical and Scientific Instruments, i 
Contractors to all Scientific Departments of H.M. 
Home and Colonial and many Foreign Governments. 
_ GrandsPrix, Diplomas of Honour, and Gold Medals.at London, Paris, Brussels, etc. 
MICROSCOPES 
AND OTHER 
INSTRUMENTS FOR 
ALL BRANCHES OF 
GEOLOGY, 
MINERALOGY, 
PETROLOGY. 
Sole Makers of the 
‘DICK’? MINERALOGICAL MICROSCOPES. 
Dr. A. HUTCKINS@N’S UNIVERSAL 
CONIOMETER. 
UNIVERSITY OPTICAL WORKS, 
81 TOTTENHAM COURT ROAD, LONDON. 
PRICE 15s. NET. IN TWO SHEETS. 
A GEOLOGICAL MAP OF THE CAUCASUS 
(WITH EXPLANATORY TEXT). 
Compiled from the latest sources by FELIX OSWALD, D.Sc., F.G.S. 
Scale 1 : 1,000,000 (15°78 miles =1 inch). 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 thelatest 
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. 
‘‘Tt is produced in a bold style, somewhat like that of Noé’s Map of the 
Alps, and embodies a good deal of personal study by the author. This work 
will be of service to many travellers, now that the district is so accessible 
through Constantinople or Odessa, and it will be of much help to readers of 
Suess’s description of the range.’’— Nature (August 30, 1914). 
DULAU.& CO., Ltd., 37 Soho Square, London, W. 
