66 . III. DIST. CHAR. Mode. 



rare: petrified fish sometimes present a bituminous 

 or coalj matter on their surface., which appears to 

 have been produced by the substance of the parts, 

 of which it retains the form. And the epidermis or 

 pellicle, which is found on some species of shells, 

 also affords, in the fossil state, a thin film of bitumen, 

 with which the petrified subjects are still covered. 



TERMS, 

 distinctive "of the Reliquium, according to its mock. 



a) 9. CONSERVATED (conservcitum) retailing the 

 organic form under one or other of the modes 

 of conservation (A. 1.) not petrified. 



10. Semi-recent f (semi-recms) coriservated 

 nearly in its recent state, the loss of substance 

 excepted (v. 2. Privation) 



11. Converted (conversum) conservated by 

 conversion (b. 3.) 



12. Impregnated (imbutum) conservated by im- 

 pregnation ( c. 4. ) 



I. ) 13. PETRIFIED (petrificatum) retaining the or- 

 ganic form under one or other of the modes of 

 substitution (B. 5.) 



-j- It has not always been expedient, for obvious reasons, to form 

 the term, discriminating the fossil by its mode, from that 

 which has been applied to the process of the mode. Hence, the 

 present terms do not, in some instances, point out the process, but 

 rather the st ate , of the mineral change. 



