Manufacturers of Optical and Scientific Instruments, 



Contractors to all Scientific Departments of H.M. 

 Home and Colonial and many Foreign Governments. 



Grands Prix,Diplomasof Honour, and Gold Medalsat London, Paris, Brussels, etc. 



ICROSCOPES 



AND OTHER 

 INSTRUMENTS FOR 



;| ALL BRANCHES OF 



GEOLOGY, 



MINERALOGY, 



PETROLOGY. 



Sole Makers of the 



"DICK" MINERALOCICAL MICROSCOPES. 



Dr. A. HUTCHINSON'S UNIVERSAL 



GONIOMETER. 



UNIVERSITY OPTICAL WORKS, 

 81 TOTTENHAM COURT ROAD, LONDON, W.I. 



OSWALD (Felix), D.Sc, F.G.S. A Geological Map of the 



Caucasus. With explanatory text. Compiled from the latest 

 sources. Scalel: 1,000,000 (15'78miles = linch). 15s. Thegeological 

 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. 



JUST ISSUED. 



CATALOGUE OF ZOOLOGICAL WORKS 



chiefly Ornithology and Entomology. 

 OFFERED FOR SALE BY 



DULAU 8c CO., LTD. 



(Established 1 792), 

 34-36 Margaret Street, Cavendish Square, London, W.l. 



LIBRARIES PURCHASED IN TOWN OR COUNTRY. 



