478 DOMAIN V. CALCAREOUS. 



STRUCTURE II. SCHISTOSE. 



Substances in this state generally present a 

 finer grain than when they occur massive. Marl- 

 slate sometimes presents delicate concentric cir- 

 cles, and other delineations, of a light brown upon 

 yellowish grey, its usual colours. 



Im of fish. " 8 But ft * s st *^ more remarkable, as being the ge- 

 neral repository in which are found the remains 

 and impressions of decayed fish. In this case it 

 is commonly penetrated with bitumen, probably 

 derived from the decomposition of their bodies, as 

 chemists now infer that substance to proceed ex- 

 clusively from the animal or vegetable kingdoms, 

 Da Costa mentions that of Mount Lebanon, near 

 Tripoli di Soria (of Syria), in the province of 

 Castravan*. 



The slate, with impressions of fish, from Eisle- 

 ben, Ilmenau, Mansfeld, &c. were formerly ce- 

 lebrated, and the animals are often delicately 

 delineated, as it were, in cupreous pyrites. At 

 present those of Mount Bolca, in the Veronese 

 territory, have attracted more attention ; and the 

 proprietor has filled a whole chamber in the mu- 

 seum of the Garden of Plants with these singular 



* P. 170. This is the Khesroanof D'Anville, and the Castracaa 

 of the Italians, whence the celebrated iumachella. 



