Lesley.] ^* [Jan. 15, 



waters of the TTpper Susquehanna, and will penetrate into 

 New York State. 



3. The North Pennsylvania north and south system, with 

 numerous branches in the Lehis-h and Wilkesbarre Anthra- 

 cite Fields, in connection with the two Lehigh Valley Rail- 

 roads, extending into the State of New York. 



4. The Northern Central north and south system, extend- 

 ing from Baltimore, in Maryland, to Elmira, in New York, 

 with several short branches. 



5. The Philadelphia and Erie northwest system, with 

 important branches crossing to the Alleghany River, and 

 into the State of New York. 



6. The Alleghany River north and south system, from 

 Pittsburgh to the Oil Region, and Buffalo in New York. 



7. The Baltimore and Ohio system, with its Connellsville 

 branch to Pittsburgh, and its short coal and coke branch. 



8. The Beaver River system, north and south, along the 

 western margin of the State. 



9. The Philadelphia, Wilmington and Baltimore south- 

 west system. 



The following tables are arranged in the above order, and 

 will explain themselves : 



I. The Pennsylvania R. R. System. 



/. Pennsylvania Railroad. 



Note.— The elevations at the various stations, on the Pennsylvania Rail- 

 road, wore copied from the Engineers' notes, by permission of Mr. W. H. Wil- 

 son, its Consulting Engineer. 



The datum, or base of levels, is ordinary high-water in Schuylkill River. 

 This datum, according to Mr. James T. Gardener's determination, is C.913 feet* 

 above mean surface of tlie Atlantic Ocean. These 7 feet are added in the second 

 column. Decimal parts of a foot do not occur in these lists. When below .5 

 they have been omitted; when more than .5a whole number has been substi- 

 tuted. 



* Permanent U. S. Coast Survey granite bench at Gloucester Ferry. N. J., oppo- 

 site Philadelphia, is S.IO al>ove Mean Tide Karitan Bay, or Mean Ocean level. 

 Mean Tide Delaware Uiver = S.IO— 1.751 = ;5.:J4i». Pliiladelphia City Surveyor's 

 datum : S.IO — 0.032 = 8.732. Pennsylvania R. R. Engineer's datum : 8.10 — 1.819 

 High tide. 6.913. 



