256 ON A NATURAL SYSTEM 



example are the marlcs, moft of the common 

 clays, mixed funds, and feveral other*. 



} xcvn. Four Genera of organic Fqffils. 



LASTLY, Organic foflils nre divided into four 

 genera, as the diverfity of their nature fuggefts, 

 whether they are found impregnated with and 

 compofed of lalts, earth, metals, or phlogiilon. 



xcvin. Fifth Genus of Cr on/led t. 



CRONSTEDT adds a fifth genus, and perhaps 

 with great propriety, in which are included all 

 the dead remains of once living fubftanccs, 

 which, .by gradual putrefaction, have loll their 

 original (truchnr, though they Hill retain fuch 

 flrong marks of it as are not obliterated entirely 

 but by the lapfe of many years. To this genus 

 belongs the earth of dctlroyed animals or vege- 

 tables. 



J xcix. Organic Bodies mineralized by Salts. 



THIS operation mud vary according to the na- 

 ture of the fublhince. Bodies immerfed in a fait 

 folurion are fometimes penetrated by it, and in- 

 durated. In this manner the entire bodies of 

 men, that had fallen by accident into the vari- 

 olated water of the mine ofFahlun were found 



