O F F O S S I L S. 307 



ly faxnm ; the third, containing metals in their 

 matrices, I denominate mincra; and the fourth, 

 from the mixture of petroleum, or other phlogU 

 flic bodies more plentifully found in it, takes 

 the name obitumc/ij or, if this name be given to 

 a clafs, picarium may be fubftituted, 



Of the organic fulfils, that which is penctrat* 

 cd with any fait may be called y?//i/f//Yi ; with 

 rarthy particles, lapidojum ; with metallic, me- 

 tal/ifcrumjand with phlogi{iic,/0///fl#tfffi. Should 

 names more proper than thefc occur to any per- 

 ion I ihall have no objection to withdraw them. 



cxciv. Of applying Names tn tbejimplcr Fqffi/s t 

 and efpcciully to the Salts. 



ALL bodier, whofe proximate principles have 

 never yet been afcertained by art, require lim- 

 pier names; the primitives efpccially Ihould be 

 cxpreflcd by one word; and thofc of a known 

 competition fliould be defined by derivatives 

 having a reference to their principles; if not of 

 one or two words, confiding at the mod of 

 three. To denote each body by a peculiar fun. 

 pie name would be productive of great incon- 

 venience, and be an ufclcfs burden to the me- 

 mory. It might however be of confuiuable 

 advantage to the fyrtcm of nomenclature, in the 

 clafs of falls, if every one of the fnnplc falls 

 could be indicated by a fmglc word. \Vould it 

 U 2 not 



