160 



GEOLOGICAL MODELS. 



Upper 

 Galleky. 



128. — Siliceous sinter, sometimes assuming the form 



Wall-case 2. 



of chalcedony. 



129. — Gypsum, in radiating crystals. 



130. — Gypsum, in thin prismatic crystals. 



131. — Crystals of native sulphur, sublimed on more 

 earthy impure sulphur. 



132. — Brecciated conglomerate, partly covered with 

 native sulphur, from the rock of which the island is chiefly 

 formed. 



133. — Volcanic ashes, forming much of the surface of 

 the country in the neighbourhood of Auckland. 



134. — Mud from a volcanic spring at Kertch, in the 

 Crimea, and used, when mixed with sand, for making pave- 

 ments. — Presented by Dr. Mac Pherson. 



135. — Naphtha, from bituminous springs at Kertch, and 

 used for various purposes instead of pitch. — Presented by 

 Dr. Mac Pherson. 





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Wall-case 3. 



Models of Rocks by M. Bar din, from the Paris 



Exposition, 1854. 



On the upper shelf is a model of the volcanic isle ot 

 Bourbon, No. 1. 



No. 2 is a model of part of the limestone rocks near 

 Sable (Sarthe). The beds are inclined at an angle of about 

 52°, and are somewhat jointed. 



No. 3 is a model of part of the (Permian ?) sandstones 

 of the Vosges (Gres des Vosges). They form tabular hills, 

 the strata lying nearly horizontally. They are much jointed, 

 and it will be observed that there are caverns in the main 

 cliff, and in front of it there are many outstanding frag- 

 ments and pinnacles, like the Needles of the Isle of Wight 

 or of Studland Bay, giving evidence that, like these chalk 





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