132 Conjectures relative to 



in Pennsylvania, his conjecture, that the ground on 

 which " the town stands has been made ground*." 



I suppose it was a peninsula of New-Jersey ; and 

 that the low ground back of, and N. W. of the 

 borough, which he describes as being, at present, 

 low marsh, meadows, and ponds, was formerly the 

 bed or channel of the River Delaware ; and that, at 

 that time, the present bed of the river was a low isth- 

 mus, which connected it with the firm land of the 

 Jerseys. 



I will now give you the reasons which confirm me 

 in the truth of this supposition. 



First. Dr. Gregg observed, at the depth of about 

 twenty-five feet below the surface, logs and limbs of 

 trees, which he thought were those of Pine. 



Secondly. When I was at Bristol, thirty or forty 

 years ago, I observed the soil to be exactly the same 

 with that of the Jersey-shore, opposite ; and that both 

 places produced the same vegetables. In particular, 

 I observed growing in the wood-lands, close to the 

 town, the Lupinus perennis, or Perennial Lupinf. 



* Section First. Page 20. 



t The Lupinus perennis is a pretty common plant, in many 

 parts of Pennsylvania. I have observed it growing in a sandy 

 soil, at a little distance from the Delaware, in the neighbourhood 

 of Prankford, about sixteen miles below Bristol. Editok. 



