51 



source either in the primitive or transition rans;e, and, 

 in every instance run through the former or granitick 

 ridge; so that there could have been no want of ma- 

 terials to form water worn pebbles. 



The same may be observed on the west side of the 

 Susquehannah river below the granite ridge. What 

 the appearances are above, I am unable to say. 



The same I believe is the case with the Delaware 

 river. How it is on the west side of the Hudson river, 

 at Bergen, and the other places in its vicinity, 1 cannot 

 recollect ; but the alluvial formation on which New- 

 York stands, is filled with rolled pebbles : while but 

 feu are to be found on the Long Island side opposite 

 or in any part of the northern shore of that island. I 

 believe that the principal part of the streets in New- 

 York, are paved with the stones that were dug out of 

 the hills, in and near the city, in levelling them down. 



These stones were, doubtless, first brought down 

 by the current of the east river ; or at least were formed 

 on and above the granite ridge ; and were subsequent- 

 ly, by the north east current, which I have mentioned, 

 raised from the bottom of the river, and deposited with 

 the alluvian on its western shore, above, and where 

 New-York stands. This is from four, to five or six 

 miles, south of where the stones were probably formed ; 

 and which distance, corresponds with that of a number 

 of other places ; which inclines me to believe that the 

 rolled pebbles in the alluvial districts of this country, 

 lie, in general, from three to five miles, aad sometimes 



