OF FOSSILS. 



c L x x i x . Fhvfical Marks. 



1'nvsiCAL marks alfo, as hardncfs and gravi- 

 ty, arc to be employed for afccrtaining varieties, 

 ivhenever they are found to throw any light. 



} CLXXX. Varieties cf organic FoJJiIs. 



THE varieties of organic foflils arc to be deter- 

 mined from the fpccics of vegetables or animals, 

 which fcrvc as guides ro our judgement. And 

 ill living bodies being defined by their external 

 appearance, the fame rule maybe obferved in 

 fliN as in the otlicr dalles. 



5 CLXXXI. F.pihguc. 



A iYSTLM ofil.flils, arranged according to the 

 foregoing method, I think is to be recommend- 

 ed for its variety, order, and utility; for tin; 

 number of fpccie:> and varieties, the manyfbld 

 combinations of principles, the feries of agree- 

 ment and difcrepancy,thc harmony and oppofi- 

 tionot internal and external characters, and many 

 other important rcafons: And 1 hope it will be 

 found to anfwcr better, not only on account of 

 its extenlive view, but ulio bccauic the riches 

 and phenomena of the organic kingdoms are in 



it more properly difphiyed than in any other. 

 T 4 \ CLXXXI. 



