2 34 The Neural Hijiory Part l^ij 

 its inveftient Shell, is of the fame fhapi . 

 and fize as is the Cavity of the Shell^Ji 

 of what kind foever tliat Shell happen- 1 

 ed to be. That this is the true Origin^ I 

 wlichcon- of Stones (confifting of Sand * 

 jift of spar, which are called, by Authors, Cochlit£^^^ 



^^-^If and which are of conftant, regular^ 

 4 Part and fpecifick Figures ; as are the Coch* , 

 ■/"^^:l'le£. toncba, and the other Shells ia 

 t^duutae. which they were moulded, and from 

 which, by reafon of their fo near re-f 

 lembiance of the infides of them, they^ 

 borrow their fever a I Denominations. 

 6. That thefe formed St ones being by 

 this means dcfpoiied of their Shells, 

 and expofed naked, upon the Surface 

 of the ground, to the Injuries before 

 recited, do alfo themfelves in time de- 

 cay, wear, and moulder away, and 

 are frequently found defaced and bro- 

 ken to pieces : in like manner as the 

 Strata of Stone wherein they were ori» 

 ginally lodged firft did : and after- 

 wards the Shells wherein thefe Stones 

 were enclofed and formed. 



This Deterration^ as 'tis called, or 

 Devolution of Earth and Sand from the 

 Mountains and higher grounds, is not 

 in equal quantity and alike in all 



places. 



