PETRIFACTIONS, no. PhytoUthus. 351 



the pieces of which are found or carious or perforated by the 

 Teredo, converted in charcoal, with or without the bark, and 

 often (o perfe6l as to dillinguifh the kind, as Oak, Aih, Fir, Sec. 



z. Marmoreoiis and often filled with fpar. 



In Ireland, Brandenburg, Bohemia, Hungary, Saxony^ Ger* 

 many, &c. 



b. In fwinellone. 



Near Boll in JVirtemburg. 



c. In Gypfum. 



In Bohemia and Piedmont, 



d. In Alumina. 



Near CreuK in lower Hungary^ 



e. In Silica, 



In England, Ireland at Loughneagh, Italy, S<witzerland, Hun- 

 gary, Germany, Saxony, Audria, Scc^ 



f» In Agate. 



Holzftein. Karjl, Lejke miner, 1. p. 136, 



In Siberia, Hungary, and Saxony, more or lefs opakc, break- 

 ing into coarfe fplinters or indeterminate fragments, a lit- 

 tle fliining, taking a fine poliih, fibrous internally, of a 

 conchoidal texture, variegated, fpotted or rtriate, blackifb. 

 or fmoke-colour, fometimes red, ochraceous or green, 



g. In Opal. 



Holzopal. Karjlen Lejke miner, I. p, 170. 



In upper Hungary, hardifh, opake or nearly fo, breaking into 

 indeteFminate fragments or long fplinters, feparating into 

 crufts, generally a little Ihining, moftly variegated with, 

 white, greyifh, brown, or ochraceous and hyacinthine in- 

 alternate (treaks. 



h. In Sandftone. 



In Silefia, Bohemia, Germany, &c. 



i. In Alumina. 



Sometimes forming large ftrata, in "England, S<tveden, Saxoay, 

 Bohemia, AuHria, Piedmont, &:c. 



k. Combined with fulphate ok iron. 



In Prujfta in the ilrata fuperincumbent on amber, and near 

 Boll in Wirtemhurg. 



1. Combined with fulphate of copper. 

 Near Herrengrund in \ov/tr Hungary t 



m. Bituminous. 



Frequently forming ent're fubterraneous woods in various 

 p<rts of England and Ireland, particularly in Lincolnjhire^ 

 in Rujfia, S^voeden^ Denmark, Frarce, Spam, Holland, Flan' 

 d':ri, Germany^ Prujsia in ftrata fuperincumbent on amber. 

 Saxony, Bohemia, Aujiria^ lto.ly> and S'witzerland, 



