VAJUOUS, 



199 



the secondary petrosilex or fyornstein of Werner, 

 not to form a separate kind*. 



" Besides, the effervescence arising from cal- 

 careous earth,, scattered amongst the elements, 

 as in the silickalce, must be well distinguished 

 from, that which arises from calcareous parts, 

 accidentally enclosed between the leaves; or in 

 the veins of secondary petrosilex, which have a 

 veined ; or schistpse form. 



cc Very near this, in the fields, are found frag- 

 ments of common compact limestone, dichter 

 kalkstein of Werner, full of sea-shells, and above 

 all of vis, screws, or tubercular strombites. There 

 are also frequently found in the same stones 

 veins of common flint. "f 



In another passage, 1537, our excellent au^ 

 thor describes the same substance, and the rocks 

 which accompanied it. As his work will pro- 

 bably never be translated, no apology needs be 

 offered for inserting the passage, though some- 

 what long. On his route from Aix to Avignon, 

 lie perceived along the high road horizontal beds 

 of a whitish limestone, which alternate with 

 of an earth of the same colour. These beds 



* " I think we must refer to this genus the stone known at 

 ftouie by the name of Selce de Madrid. Patrini Gabinetto Mine- 

 alogico, t. i. p. 16 1." 



t 1524. 



