MODE XIV. CALCAREOUS GLUTBNITE. 



bricia, and which was deposited at the same time, 

 or alternately with them, have enclosed and kept 

 them in that position."* 



The nagelfluh of the Swiss is a bricia, with a 

 calcareous cement; the fragments seem to be 

 commonly siliceous ; but Mr. Jameson says that a 

 kind, wholly calcareous, is found in Bavaria ; it is 

 incapable of polish. 



It is singular that no bricia can be clearly and 

 positively assigned to the times of ancient art. 

 ferber informs us, that the Italians apply the 

 word bricia to any marble, which has spots that 

 are clear and distinct ; while it ought to be con- 

 fined to real bricias, consisting of fragments joined 

 by a calcareous cement. 



The bricia which seems to have the best claim African bricia, 

 to antiquity, is that called the African, which, on 

 a black ground, presents large fragments of a 

 whitish grey, of a deep red, or of a dull purple. 

 Of this marble there is a large column in the 

 Napoleon museum; but the name of African 

 seems to have been bestowed merely on account of 

 its black ground ; for it is not mentioned by any 

 ancient author, and, if known to antiquity, was 

 probably Grecian ; perhaps the Chian, with spots 

 of many colours on a black ground. As the walls 



841, 



