The Natural Hifory Part 



That when the Water of Rivers 

 fues out of the Apertures of them with 

 more than ordinary Agitation and Ra- 

 pidity, it ufually bears forth along with 

 it fuch Particles of Spar, Argilla, or 

 other loofe and moveable Matter as it 

 met with in its Pallage through the 

 Stone, Marble, or other folid Strau : 

 that it fuitains thefe Particles, and car- 

 ries them on together with it till fuch 

 time as its Motion begins to remit and 

 be left rapid than it was at, and near 

 its Source ; when by degrees it lowers 

 them^ and lets them fall, depofing and 

 affixing them upon any thing which 

 occurrs in the way, as Stones, Shells, 

 Sticks, or other like Bodies; efpecialiy 

 thofe which lye in the Sinus's or 

 Creeks of thofe Rivers where the Mo- 

 tion of the Water is more fluggifh and 

 languid than in the Stream, or middle 

 of the Chanel. That fome Rivers 

 do thus bring forth Spar, and other 

 mineral Matter in great quantity, fo 

 as to cover and incruft the Stones, 

 Sticks, and other Bodies lying therein^ 

 to a very confiderableThicknefs. That 

 fometimes the Water of Standing- 

 Springs does the fame : precipitating 

 the mineral Matter which it brought 



