132 



SCIENCE. 



[N. S. Vol. XII. No. 291. 



River was based upon the following facts : change was supposed to have taken place 



(1) the lowness of the divide at Dahlonega, when the surface relief was slight, presum- 



Georgia between the Etowah Eiver and a ably on the elevation of the Tertiary pene- 



branch of the Chattahoochee River ; (2) plain above baselevel. 



the similarity of the alignment of the be- The conclusion that the upper coarse of 



Fig.l. 



Drainage map of the Southern Appalachian region, showing recent stream diversions, 

 and Campbell. 



Hayes 



headed portion with that of the remaining 

 Etowah River, as shown at B on the map 

 and (3) the plainly apparent tendency of 

 the southeastward flowing streams to en- 

 croach upon their neighbors on the north- 

 west in all the territory about the head- 

 waters of the three rivers in question. This 



the Chattahoochee River has been trans- 

 ferred to the Savannah system by diversion 

 near Tallulah Falls, at the point marked C 

 on the map, was based on similar grounds, 

 but in this case the proof is stronger for the 

 southeastward flowing streams show even a 

 greater tendency to encroach toward the 



