63. A. SYSTEM OF 



As it everwas and mult Ipe very difficult 

 to give intelligent defcriptions of colours, 

 fo we are quite at a lofs to underftand the 

 meaning' or the antients in this refpect ; but 

 this ^indeed is of little confequencc, as we 

 feem to have the fame right,""under the fame 

 circumflances, of inventing new names for 

 them ; and that in whatever language* we 

 pleafe. Neverthelefs I have defcribed ibme 

 few varieties of thofe which at this time are 

 the moft common, to ferve as inftances. 

 a» Brown opaque agate, with black veins, 



and dendritical figures^ the Egyptian 



pebble. 

 £• Of a chalcedony colour, Achates choice- 



donifans. 



c, Semi-tranfparent, with lines of a blackiih 

 brown colour, and dendritical figures, the 

 Mocha Hone. 



This is much eiteemed, and makes a 

 valuable part of ibme collections, where 

 it has a place chiefly for the fake of its 

 figures, refembling vegetables, animals, 

 &c. which however are often improved by 

 art. 



d. Semi-tranfparent with red dots, Gemma 

 divi Stephani. 



When the points are very minute, fo 

 as to give the ftone a red appearance, it is 

 by fome called Sardca. 



f. Semi-tranfparent, with clouds of an orange 

 colour. 



/. Deep red or violet, and femi-tranfpai;ent. 



g. Of many colours, or variegated. 



i> 9 Black, 



There 



