'6 Scientific Intelligence. 



Stevenson. 420 pp. 8vb, with 3 sections and 2 County maps, 



-"•*'■'- ! ■ ' 11' >1 depths of the Pittsburg and W. 



(2.) Report of Progress in ,1,, District of York and Adams 

 Counties. 196 pp. 8vo, with Maps and Cross-sections showing the 

 Iron-ore belts and individual Mines ; bv Peksipoe Fkazer Jr 



Mr. Stevenson's Report, after chapters on 

 of the district and its Quaternary geology, describes in detail the 

 Carboniferous strata, r hetr ,,,, ti „ n ._ anil 



then takea -v of the several townships, giving 



n on the coal beds and 

 coals. lhe closing chapter, on Economic Geology contains 

 V-u as to the thickness and variations of the coal 1 , <ls. the 

 •;.;.n of coals, constitution and value , i 

 the distribution and source of the petroleum of the district. Mr. 

 Stevenson M ])0t arigen 



from the distillation of shales, but that "it is in the highest 

 degree probable that the v. -efal.le matt.-. 



- .. . , ..: 



into petroleum u ! ,1, ril„ ,„!, , „! .,,,„,. , ,„, , 



«r» Jt 1 1 . ]ace9 ] °f t >ieOh 1 o and Alleghany valleys are described 



- } d 1 - upper is of various height., 180, 



■ 4" let. l-r„m .Mn,,o,,ualula to Pitt sbuig terraces 



are stated to be very distinct at 190 and 290 feet; while at the 



</ there are seven terraces at id, 120, 190,290,340, 



M.d below Pittsburg, at Chartiers, there are 



P , t n,eji,„li, tteo, th.iu ti val 



: ' ' ': ' 



■ ".- ,.,-n,»I, ..1 indefinite supply from the melting o i 



Mr. Frazer treats of a belt in Eastern Pennsylvania which in- 



nerous hmonite beds asa , r li mes tone 



""<! hy homica slates, similar in character and position to those 



/mg the Green .Mountain t-,-i.-,,i in Berkshire, Mass.. 



] parts of Not York, 



and also m \ erne „, 1, n f ; p^hinn of the rocks is made 



several sections presenting the author's pres- 



' .. . - : - 



unty. The main point set forth is that the limestones 



e with most 



«w sections observed by the writer in Berkshire. 



2 J. r - 8o c r tan,s ,1, - n ! m "^ " i -""■ - '!•-'- - iiv- 



anal ses ofToTore^ 68 ' Iimest ° neS ' and detai l ed descriptions and 

 foJLn* th % Glacial Phenomena of North America; by Pro- 

 TWoS ' " tSH ' '"' fI>,< " Am " r ' W • l "'" il ! - 



New Tork n Tim * Tf ° f the papeF hj Prof ^ s " r T " ,vil "' ,1,,; 

 ahwnste • '"" ? "" y be as8umed that the 



temperature, due either to great e; , lllle8 or t0 



