160 Scientific Intelligence. 



detail, and discusses also other points connected with the phys- 

 ical history of the region. He speaks also of the shaded sheets 

 (maps) issued by the Ordnance Survey as reproducing with mar- 

 velous skill the surface features of the country even to minor points 

 of glacial origin ; and asks in conclusion : " With such admirable 

 cartographical work before them, how long will intelligent teach- 

 ers continue to tolerate those antiquated monstrosities which so 

 often do duty as wall-maps in their school-rooms." 



3. Pennsylvania Geological Survey. — This Survey has re- 

 cently issued the following reports: 



Report on the Coal Mines of the Monongahela River Region,, 

 from the West Virginia State-line to Pittsburgh, including the 

 mines on the Lower Youghiogheny River (No. K 4), by J. 

 Sutton Wall. Part I. Description of the Mines, 232 pp., 8vo, 

 with maps and plates. Harrisburg, 1 884. 



Report on Perry County (No. F 2), by E. W. Claypole. 

 438 pp., 8vo, with many plates, maps and sections — a geological 

 report preliminary to an account of the Paleontology. Harris- 

 burg, 1885. 



Atlas of the Northern Anthracite field, Part I (No. A A). 



Maps and charts of the Report on Cameron, Elk and Forest 

 Counties (No. RR). 



Grand Atlas, Division III. Petroleum and Bituminous Coal 

 Fields, No. I.— The first part issued of this "Grand Atlas" of 

 the Geological Survey of Pennsylvania was noticed on page 340 

 of the last volume of this Journal. The Atlas is to appear in 

 five Divisions. Division I is to contain the geological maps of 

 the counties constructed on a scale of two miles to the inch, and 

 will consist of 49 sheets, covering fifty-six counties ; Division II, 

 the sheets of the Anthracite Survey, including mine sheets on a 

 scale of 800 feet to the inch, topographical sheets on a scale of 

 1600 feet to the inch, cross-section sheets and columnar-section 

 sheets, besides miscellaneous sheets; Division III, of which 

 Part. 1 has recently been issued under the above-mentioned title; 

 Division IV, topographical maps from the surveys of A. E. Leh- 

 man, of the South Mountain, in Adams, Franklin and Cumberland 

 Counties, and others of the Great Valley, between Easton and 

 Reading, from the surveys of Messrs. d'Invilliers, Berlin and 

 Clarke, on a scale of 1600 feet to the inch, with the contour lines 

 10 or 20 feet apart ; Division V, the geological maps and sec- 

 tions relating principally to the Silurian and Devonian formations 

 in Central Pennsylvania, and cross-sections of the Philadelphia 

 rocks. 



The maps on the Petroleum and Bituminous coal fields, making 

 the first part of Division III, contain topographical maps, plans,, 

 cross-sections, and others, illustrating the geological structure of 

 the oil region, the distribution of the areas, the underlying rocks 

 down to the oil-producing sand beds in a large number of sec- 

 tions obtained in boring for wells, and are thus full of instruction. 

 The general map of the oil-region, prepared by C. A. Ashburner,, 



