72 .,111. DIST. CHAR. Farm. 



by the mineral matter of the petrifaction, if it had 

 not been united to an extraneous form. 



Obs. Thus, internally, petrifactions exhibit the 

 compact, foliated, or slaty structure (fracture. Wer- 

 ner ) according to the mineral disposition of the mat- 

 ter of which they are composed ; and, externally, 

 they have an earthy, granular, and, often, drmy, 

 appearance, distinct from that which existed in the 

 original body ; and dependant on the particular 

 form of the particles of the constituent substance. 



b. 38. THE MODAL ACCIDENT. F. (Forma fort, 

 modalis) is the peculiar structure or form which ihe 

 mode (Modus, page. 39. ) has imparted to the reli- 

 quium, so as to alter, or more or less conceal, that 

 which belongs to ihe prototype. 



Obs. Thus the compressed or flattened form, 

 is often the consequence of the mode in which the 

 mineral change has been brought about, and not the 

 effect of a similar structure in the original. Some 

 reliquia retain the form only of one side, or of one 

 half,of the organized body represented; while others 

 present the whole of the external or internal or- 

 ganic fabric, according to the manner, in which the 

 mineral matter has been united to the animal or 

 vegetable figure. 



petrifactions. The Fossilia nearly answer to our Reliquia, and 

 the Impressa and Incrustata properly belong to the matrix (v. 

 SOIL. Matrix. &c.) 



