PRICE, WITH SUPPLEMENT, ONE SHILLING- AND SIXPENCE. 



YOL. IV. SEPTEMBER, 1861. No. 45- 



THE GEOLOGIST; 



AN ILLUSTRATED 

 POPULAR MONTHLY MAGAZINE 



GEOLOGY. 



EDITED BY S. J. MACKIE, F.G.S., F.S.A. 



" Geology, in the magnitude and sublimity of the objects of which it treats, 

 undoubtedly ranks in the scale of the sciences next to Astronomy."— Herschel : 

 Discourse on Study of Natural Philosophy. 



LONDON: 



PUBLISHED AT THE OFFICE OF THE GEOLOGIST, 

 25, GOLDEN-SQUARE, EE GENT- STREET, W. 



BAILLIERE, BROTHERS, 400, BROADWAY, NEW YORK; B. DAWSON & SONS, 



MONTREAL. 



MESSRS. J. B. BAILLIERE ET FILS, RUE HAUTEFEUTLLE, PARIS. 

 C. BAILLY BAILLIERE, CALLE DEL PRINCIPE, MADRID. 



FEINTED AT THE GEOLOGIST OFFfCE, GOLDEN-SQUARE, LONDON. 



