SECTION Iir. 71 



if that does not compleat the cleaning, I 

 would advife to rub or brufli them araia 

 with tripoli or emery, or a weak acid, or 

 with a ftronger one, much diluted with 

 water ; always taking care to dip them 

 every minute in clear cold water. Strong 

 foap may alfo be ufed with a rag or piece 

 of woollen or linen, with which rubthem; 

 and when Efficiently cleaned this way, a 

 fine brufli, with fine emery, will finifli the 

 whole. But all thefe proceffes mud be 

 judicioufly managed according to the at- 

 tendant circumftances, which it- is impot 

 fible to regulate in writing. 



The fcientifical colleftors, or naturalifts, 

 are always defirous of having the Shells in 

 fheir rough ftate, or juil: as they are fiflied. 

 This method, though extremely ufeful, is 

 not to be abfolutely followed ; not only 

 becaufe their beauties would be lofl, but 

 alfo on account that the fpecies dittering 

 }n colours could never be truly defined. 

 Hoy/ever, as a medium, I would advife all 



F 4 cqile(3:Qrs 



