62 



gineers, U.S.A., by Clarence King, United States 

 Geologist in charge, 1876. 



1883. Lent by Prof. J. Norman LocTeyer, F.R.8. 



A folio atlas, 33 in. by 24 in., containing five geological and 

 five topographical maps, and one of geological sections. Each 

 of these maps, whether geological or topographical, representing 

 the same areas, are in two sheets. The former are contoured at 

 intervals of 300 ft., the latter are shaded. There is also a sketch 

 map of the Cordilleras of the Western United States. 



198. Geological and geographical atlas of Colorado 

 and portions of the adjacent territory. ".Department of 

 the Interior, United States Geological and Geographical 

 Surveys of the Territories, by F. V. Hayden, United 

 States Geologist in charge, 1877. 



1883. Lent by Prof. J. Norman Locltyer, F.R.S. 



A folio atlas, 27 in. by 19 in. Contains three general, six 

 topographical, and six geological maps, two sheets of geological 

 sections, and two pan oratnic views. The general maps are on 

 the scale of 12 miles to the inch. The topographical and geolo- 

 gical maps on a .scale of four miles to the inch. They refer to 

 the same areas respectively, each including 2^ degrees of longi- 

 tude and 1 J degrees of latitude, and are each contoured at inter- 

 vals of 200 ft,, differing only in the colouring. Each is in two 

 sheets. 



199. Five outline sections of the strata under London, 

 with a block index plan. 



1876. Lent by the late R. W. Mylne, F.R.S. 



This contains, mounted on one sheet, framed and glazed, the 

 following : 



(a.) Section of a Well sunk at Hampstead Hoad reservoir, 

 1838, with details of the strata and their thicknesses. 



(6.) Plan of London and its suburbs, 1851. Scale, about two- 

 thirds of a mile to the inch. 



(c.) Section of the London strata in a direct line from Hamp- 

 stead to Camber well, 1850. This is deduced from the sections 

 of wells sunk in spots adjacent to the line of section, 24 of which 

 are indicated in position, with the strata exposed in the section. 

 Horizontal scale, 3 inches to the mile, vertical scale, 100 feet to 

 an inch. The whole coloured geologically. 



(d.) A similar section from Highgate to Peckham, with 22 

 well sections. 



(e.) A similar section from Newington to Lewisham, with 18 

 well sections. 



(/.) A similar section from Kensington to Greenwich, with 12 

 well sections. 



(</.) A similar section from Chiswick to BoW, with 24 well 

 sections, all on the same scale and all constructed in 1850. 



