OF FOSSILS. 27* 



Of triple fpccics we have as follows : 

 pern, pea, pcs, pma, pms, pas, 

 cm a, cms, cas, 

 mas. 



Quadruple : 



pema, perns, peas, prnas. 



Laftly, One quintuple only : 

 pcmas. 



In this manner, from the whole clafs of 

 rarths, bcfides the five funplc fpccics, contain- 

 ing the primitives alone, we can obtain but 

 twenty-fix different combinations; which, toge- 

 ther with the five fmiplc, amount in all to thirty- 

 nc. 



j cxxx v 1 1 . IVby this Method is impcrfccl. 



IN thispbn, lunvcvcr, the number of the fpe- 

 cies is too much limited, and our conclufions 

 liable to error. It \\ ill caiiiy appear that pa, for 

 example, mull be feparaled ; iur the character 

 of the mafs, with an cxccfs of ponderv^us earth, 

 \\ill be by no means the fame as with an excels 

 of clay. In like manner puc ihouid be referred 

 to three dillinift genera, according as the liril, 

 the fecund, or the third principle bear thcgrcat- 

 3il flure in the conipofition, ($ 78.). The fame, 



indeed 



