DOMAIN V. CALCAREOUS. 



of mankind. In a scientific point of view, sub- 

 servient tpjthe general plan of this treatise, they 

 may be divided into four principal structures; the 

 Granular; the Compact; the Conchitic, or that 

 containing shells; and the Zoophytic, or that 

 with madrepores, &c. ; beginning with those 

 found in ancient monuments, and ending with 

 the more modern ; the colours being merely re- 

 garded as varieties: though some, from their 

 rarity and singularity, as, for example, the white 

 venular marble of Durness, and lumachellas of 

 Bleyberg and of Castracan, or Castravan, in Sy- 

 ria, falsely ascribed to Astracan, ought rather to 

 form diversities. The bricias, and some others, 

 will of course be described among the Calcareous 

 Glutenites*. 



* The division of marbles by a scale of colours, proposed by 

 Daubenton, has been found alike useless and impracticable. Be- 

 sides the six divisions here adopted, of Granular, Compact, Con- 

 chitic, Zoophytic ; with Serpentine marbles, and Glutenites, there 

 might be the following subdivisions, or aspects : 



Urn-coloured, white, black, red, &c. 



Straight-veined. 



Mazy, with irregular short veins. 



Mixed, equal spots of various colours. 



Spotted, large spots. 



Speckled, middling spots. 



Dotted, small spots. 



Ocular, like eyes, occhiato. 



Streaked, long spots, &c. &c. 



