OF THE APPALACHIAN CHAIN. 531 



First. The section across the Weald, from the South DoAvns, 

 Western Sussex, to the Surrey hills. In this, the dip, on the 

 northern side of the great axis, is represented as slightly greater 

 than on the southern side. 



Second. The two combined sections, along the southeastern 

 and southwestern coasts of the Isle of Wight. The axis travers- 

 ing this island, and continued to Purbeck, is represented on the 

 map accompanying the memoir of Dr. F., as parallel with that of 

 the Weald. The sections referred to cross this axis, and exhibit 

 a much greater steepness of dip on the northern than the southern 

 side. 



Third. The three sections across the vale of Wardour, trans- 

 verse to the axis of that region. In aU of these, the preponder- 

 ance of dip on the northern side is very great. 



This series of curved or undulating axes, which are, in the main, 

 parallel to each other, would thus appear to manifest laws of 

 structure, strictly analogous to those of our Appalachian region ; 

 and they serve still further to confirm us in our belief of the prev- 

 alence of similar features, among the flexures, in all regions of 

 extensive disturbance, as well as to increase our reliance on the 

 justness of the theoretical views by which we have attempted to 

 explain them. 



In conclusion, we would express our belief, founded on the 

 phenomena referred to in this memoir, and on numerous similar 

 geological facts, of recent as well as ancient date, which cannot 

 be mentioned in this place, that all great paroxi/smal actions, from 

 the earliest epochs, to the present time, have been accompanied 

 by a ivave-like motion of the eartli's crust. 



