I. GEOLOGY. 839 



The position of the boring is shown in the Geological Model of 

 the Weald which is exhibited in an adjoining case. Further details 

 of the structure of the districts can be seen in the maps and sections 

 of the Geological Survey. 



3271. Geological Maps in relief, embossed in paper, of 

 ENGLAND AND WALES, after Sir R. I. Murchison, and THE ISLE 

 OF WIGHT, after H. W. Bristow, F.R.S. Henry F. Brion. 



3272. Model of Etna. Th. Dickert, Poppelsdorf, near Bonn. 



The model exhibited is a scientific work, much valued and used by all the 

 larger institutes of Germany for illustration in their science classes. 



3273. The Great Crater of Vesuvius. Photograph, show- 

 ing the interior after the eruption of April 1872. 



Robert James Mann, M.D. 



This photograph was taken by Mr. J. M. Black from the gap in the broken 

 edge of the rim. The top of the great rent, extending north and south through 

 one side of the cone into the Atreo del Cavallo, is shown on the further side of 

 the crater between the rounded and pointed eminences. 



3274. Four Sketches representing a Volcanic Eruption, 



to illustrate the form. 



Mineralogical and Geological Cabinet of the School of 

 Industry, Cassel (Dr. H. Moht). 



3275. Pour Views of Crater Eruptions. 



Mineralogical and Geological Cabinet of the School of 



Industry, Cassel (Dr. H. Mohl). 



The drawings are used as wall maps to illustrate geological lectures. For 

 more information, v. Papers XI., XIII. 



3276. Photographic Views (2) of Mount Sorrel granite 

 quarries, Charnwood Forest, Leicestershire, by Messrs. T. and J. 

 Spencer. W. J. Harrison, Town Museum, Leicester. 



This rock is a tough hornblendic granite, largely used for revatt setts, 

 kerbs, &c. 



3277. Photographs of the slates and syenites of Charnwood 

 Forest, and of a column of the hard rocks of Leicestershire erected 

 in the grounds of the Leicester Town Museum. 



W. J. Harrison, Town Museum, Leicester. 



These rocks are coloured as Cambrian on the maps of the Geological Survey, 

 but they have yielded no fossils, and the evidence of superposition is not clear, 

 as the oldest rocks near are of Mountain Limestone. The views are by Messrs. 

 J. Burton and Sons. 



3278. Hock Sections. Series prepared for microscopical 

 examination. James How 8? Co. 



3281. Belief Map of the Habichtswald, near Cassel, 

 province Hesse-Nassau ; petrographically coloured. 



Friedrich Sievers, Wehlheiden, near Cassel. 



