^6 Egypt is gradually augmented 



it's Bounty upon it. The prefent State and Condition there- 

 fore of the U-pper Egj>pt, is fo far from being an Objection^ that 

 it proves, in fome Meafure, the very Point that is difputed ; 

 viz. That ihe^ilQ, in a Term ofTears^ may fo far accuynulate 

 ifs Soil upon the adjacent Tlains of the Lower Egypt, [as it 

 hath already done in the Upper,) that it will not he capable to 

 overflow them. 

 No Stony ^5 to the Other Objections, above recited, we mav even 



Particles . r i 



brought difpute the very Fa(3:s, Upon which the v are founded. For, as 



down by^ •' iiii-' 



the River, ^q the firft, it can hardly be admitted, that any of the original 

 ftony Particles, brought down, from Ethiopia, by the Nile, 

 fhould be fo ftrongly buoyed up by the Stream, as not to 

 fubfide, a long Time, before their Arrival at the Catara^is. 

 Neither could any further Acceifion of thefe ftony Particles, 

 engaged afterwards by the Stream, cither in paffing by thefe 

 Rocks or the fandy Iflands that lye in it's Way afterwards, 

 continue long to be fupported ; let the Stream be never fo 

 rapid and violent. They, from their own Weight d.ndi fpecific 

 Gravity, muft either be dropped, of Courfe, as foon as the 

 extraordinary Rapidity of the Current ceafes ; or elfe they 

 muft be lodged immediately at the very Foot of thofe very 

 Rocks, or along the Skirts of thofe very Iflands, from whence 

 they were thus violently rubbed of and obtained. 

 The Beds of Nay, it may well be imagined, that the Beds of Rivers, 

 rather grow particularly thofe which are of a rapid Nature, like the Nile, 

 increaie. ^ do rathcr grow lower, than rife or increafe. For their Bottoms 

 being conftantly difturbed, by the violent Motion and Friftion 

 of the Current ; one Particle of Sand or Gravel muft impell 

 another, 'till the Velocity of the Stream abates, or thefe Par- 

 ticles meet with fome Impediment or Obftru6lion. And this 

 is probably the Caufe, why Rivers are generally the deepeft, 

 in their middle Channel ; becaufe the Current is there the 

 ftrongeft ; and why again it is, that Eddies, Whirlpools, the 

 immediate Outlets from Mills, Sluices &c. are ufually of great 

 Depths ; becaufe the Stream, in thefe Cafes, plungeth itfelf 

 here with greater Violence, and putting thereby the neigh- 

 bouring Particles of Sand and Gravel in Motion, protrudes them 

 all before it. It is owing alfo to the fame impulfive Force and 

 Aaion, that the Banks of Rivers and their ordinary Depths 



of 



