JAMES SWIFT & SON, 
Manufacturers of Optical and Scientific Instruments, 
Contractors to all Scientific Departments of H.M. Home 
d Colonial and many Foreign Governments. 
Crands Prix, Diplomas of Honour, and Gold 
Medals at London, Paris, Brussels, ete. 
MICROSCOPES 
AND OTHER 
INSTRUMENTS FOR 
ALL BRANCHES OF 
GEOLOGY, 
MINERALOGY, 
PETROLOGY. 
Sole Makers of the 
“DICK ’? MINERALOGICAL 
MICROSCOPES. 
Dr. A. HUTCHINSON’S 
UNIVERSAL GONIOMETER. 
University Optical Works, 
81 TOTTENHAM COURT ROAD, 
LONDON, W. 1. 
OSWALD (FrEntx), D.Sc., F.G.S. A Geological Map of the 
Caucasus. With explanatory text. Compiled from the latest 
sources. Scale1: 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. 
No. 86. JUST ISSUED. 
CATALOGUE OF 
Important Works on ZOOLOGY 
OFFERED FOR SALE BY 
DULAU & CO., LTD. 
(ESTABLISHED 1792), 
34-36 Margaret Street, Cavendish Square, London, W.1. 
LIBRARIES PURCHASED IN TOWN OR COUNTRY. 
