214 TRAVELS THROUGH 



<cl r i3jTfidiA ( ih 

 the artifls. The modern marbles employed at 



Rome fhall be noticed in thofe places where they 

 are dug out. Though the defcription of the co- 

 lours be very difficult and of little ufe, fince the 

 colours only make varieties; yet a Naturalift 

 fhould, by a due regard for the finer arts, be as 

 nearly as poflible acquainted with them, and An- 

 tiquaries mould not neglect them. Practice, and 

 frequent examination, teach beft how to diftin- 

 guilh the different fpecies ; which may be obtained 

 by fmall famples, fold at Rome, Naples, and 

 Florence. I cannot advife the purchafing of what 

 they call a whole fet or Audio, becaufe that is buy- 

 ing many indifferent famples, and many falfe deno- 

 minations; unlefs a Naturalift: mould choofe to pur- 

 chafe different ftudiain different places, and thence 

 to form a compleat one, by examining the juftnefs 

 of the names, and by throwing away what was indif- 

 ferent in itfelf, or went under falfe and improper 

 names. I hope my lift of the different fpecies and 

 varieties of Porphyry, Granites, and Bafaltes, will 

 be as compleat and exact as poflible. But it is 

 difficult and expenfive to get at their famples, 

 and at the other pretended Pietre dure> fuch as 



r ' r o 



jalpers, agates, cornelians, &c. 



The before- mentioned antique marbles and 

 itones may be ranked under the following genera : 



Marble, 



