ON A NATURAL SYSTEM. 



VARIETIES. 



c LX x 1 1 , Or tUna ry Confufion of Varietlet ivitb 

 Species. 



TiiAT many varieties have been obfervcd in 

 fpecies properly determined i* the more evident, 

 as they have, for the moil part, been coniidercd 

 us different fpecics. A milhike to which the 

 practice of the niineralogiiU in determining fpe- 

 cific differences from external marks undoubted- 

 ly gave rife. 



5 CLXXIII, Criteria if Varieties to be taken f 

 external 



IN the foregoing, we have ihewn that fpecific 

 marks were to be taken from the particular com- 

 pofition ; but although fuperlkial criteria do not 

 vdTect the intimate nature of thefc bodies, yet 

 they are not by any means to be neglected ; 

 they are well calculated to determine varieties, 

 and are even ufeful, not only in leading often a 

 Jkiliful eye to proper diacritic experiments, but 

 in throwing light upon the mode of production, 

 and other interefling circumftances. 



$ CLXXIV, 



