I. GEOLOGY. 701 



2. MAPS, DIAGRAMS, FOSSILS, &c., EXHIBITED BY VARIOUS 

 CONTRIBUTORS. 



3255. The Contours of London and its Environs. Plain 

 and coloured geologically. 



176 square miles, scale yyi^, 1856. R. W. Mylne, F.R.S. 



3256. London and its Environs Topographical and Geo- 

 logical. 



131 square miles, scale TT ^2-, English and French geological 

 references, 1855. R. W. Mylne, F.R.S. 



3257. Section of a Well at the Hampstead Road, showing 

 detail depths of strata, 1840. R. W. Mylne, F.R.S. 



3258. Five Outline Sections of the strata under London, 

 with a block index plan, 1850. R. W. Mylne, F.R.S. 



3259. Topographical and Geological Map of London and 



its environs. 



100 square miles, scale 1 '43 inch to a mile, 1851. 



R. W. Mylne, F.R.S. 



3260. Geological Map of London and its Environs. 



159 square miles, scale 1*43 inch to a mile, with a longitudinal 

 section of 18J miles, 1871. R. W. Mylne, F.R.S. 



3261. Geological Map of the London and Paris Basins. 



The tertiary and cretaceous districts of England and the north of 

 France, Belgium, Holland, and Denmark. 



The coalfield areas and contoured depths of the adjacent seas, 

 1862. R. W. Mylne, F.R.S. 



3262. Map of the Bristol Coalfields and country adjacent, 

 geologically surveyed by William Sanders, F.R.S. (In nineteen 

 sheets.) Bristol Museum and Library. 



The area of the map is 720 square miles. The topographical basis consists 

 of a reduction to the scale of 4 inches to the mile of 218 parish maps. The 

 geological lines are entirely the result of the author's personal surveys ; about 

 20 years were devoted to the work. The map was published, in 1864, at the 

 author's cost. 



A reduced copy, on the scale of 1 inch to the mile, in one sheet, was 

 published in 1873. 



3264. A Geological Map of the British Isles, by Pro- 

 fessor John Phillips, F.R.S. Thomas Burt. 



