JAMES SWIFT & SON, 
Manufacturers of Optical and Scientific Instruments, 
Contractors to all Scientific Departments of H.M. 
Home and Colonial and many Foreign Governments. 
Grands Prix, Diplomas of Honour, and Gold Medal/sat London, Paris, Brussels, etc. 
MICROSCOPES 
AND OTHER 
INSTRUMENTS FOR 
ALL BRANCHES OF 
GEOLOGY, | 
MINERALOGY, 
PETROLOGY. 
Sole Makers of the- 
‘DICK’? MINERALOGICAL MICROSCOPES. 
Dr. A, HUTCHINSON’S UNIVERSAL 
CONIOMETER. 
UNIVERSITY OPTICAL WORKS, 
81 TOTTENHAM COURT ROAD, LONDON, W.1. 
OSWALD (Fenix), D.Sc., F.G.S. A Geological Map of the 
Caucasus. With explanatory text. Compiled from the latest | 
sources. Seale1: 1,000,000 (15°78 miles=1linch). 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. 
Palzeontographical Society. 
VOL. LXXII (for 1918). 4to. Boards or wrappers. £1 5s. 
| 
CONTENTS. | 
1. The Pliocene Mollusea. Vol. ii, parti. By F. W. HARMER. 
With 8 plates. 
2. The Ordovician and Silurian Bellerophontacea. Part i. By 
Dr. F. R. COWPER REED. With 8 plates. 
London: 
DULAU & CO,., Ltd., 34-36 Margaret Street, Cavendish Square, W. 1.: 
