Manufacturers of Optical and Scientific Instruments, 



Contractors to all Scientific Departments of H.M. Home 

 and Colonial and many Foreign Governments. 



Crands Prix, Diplomas of Honour, and Gold 

 Medals at London, Paris, Brussels, etc. 



CROSCOPES 



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. 1. 



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 ajid Entomology. 

 OFFERED FOR SALE BY 



DULAU 8c CO., LTD. 



(Established 1792), 

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



LIBRARIES PURCHASED IN TOWN OR COUNTRY. 



