49 



f lazed From drawings in lampblack and pencil by 

 rank Butley, F.Gr.S., of H.M. Geological Survey, 



1876. Lent by Frank Butley, F.G.S. 



They have been published in the Monthly Microscopical 

 Journal. The two upper illustrate structures in obsidian, 

 leucite, and perlite ; the two lower illustrate plagioclase and 

 microcline structure. 



150. Wall map of tbe natural history of the Mineral 

 Kingdom, by Dr. GL Seelborst. 



1877. Given by P. C. Geissler, Nurnlerg. 



This consists of six coloured plates, which are mounted on 

 linen so as to form a single sheet. It will fold up and go into a 

 portfolio. The text is printed on both sides of the map. The 

 first four plates represent mineral masses and crystals, and 

 the last two represent fossils. No date is attached. 



151. Table of British strata, showing the order of 

 superposition and the comparative thickness of the forma- 

 tions. Size, 4 ft. 5 in. by 2 ft. 4 in. In a frame, glazed. 

 Published by Chapman and Hall. 



Given by the late K W. Bristow, F.B.S. 



The strata are represented in three parallel columns, each 

 showing the whole series ; the first for the great subdivisions, 

 the second for the smaller subdivisions, and the third for the 

 lithological characters. The proportion assigned to the Palaeozoic 

 rocks is about 84 per cent, of the whole ; to the secondary rocks 

 about 13 per cent., and to the tertiary about 3 per cent. 



VIII. BELIEF MODELS. 



152. Terminological relievo maps, by Paulini. Size 

 12 in. by 10 in. Edited by the Imperial Royal Admini- 

 stration of Text Books, Vienna. 



E. 173. 1862. 



Presented by the Austrian Government. 



These are coloured models of alpine and lowland surface 

 features in black wood frames. They are not geological, but 

 indicate the geographical terms applied to the surface. 



153. The Island of St. Paul in the Indian Ocean. By 

 Capt. J. Oybule. In morocco case. Size 23 in. by 19 in. 



E. 129. 1862. 



Presented by the Austrian Government. 



This model is in electro-bronze for the land, and blue painted 



surface for the sea. The depths of the water within the crater 



