CONTENTS. 



CHAP. XLI. page 2^4. 



Pitcoal. 



Different Species of Coal.Newcaftle Coal. Culm. Slate Coal. 

 Cannel Coal. Kilkenny Coal. Bovey Coal. Peat. Coke. 

 Coal Tar* Natural Hiftory of Coal. Observations relative to the 

 Deluge. 



CHAP. XLIT. page 274. \ 

 Naphta, Petroleum, Barbadoes Tar, &c. 



Nature and Properties of Naphta. Burning Fountains. PetroJeurff^^ 

 Mineral Pitch, or Barbadoes Tar. Lake Afphaltes.Afphaltumi 

 ho--w colleffed. Elaftic Bitumen. Component Principles of tbefc 

 ' Dances. 



CHAP. XLIII. page 277. 

 Jet, Amber, Ambergris, and Mineral Tallow. 



General Properties of Jet. Its Nature and Origin. Amber. Acid 

 of Amber. Natural Hiftory of Amber. Different Opinions of its 

 Origin. Ambergris. Its Natural Hi/lory. Mineral Ta/loiv. 



CHAP. XLI V. page 282. 



Of the Diamond confidered as an inflammable Subflance. 

 Natural Hiftory of Diamonds. Varieties. Internal Structure. Ex- 

 periments proving the inflammable Nature of the Diamond. -Experi- 

 ments of M. Cadet Of D'Arcet. Vital Air neceffary to the Com" 

 luftion of the Diamond. Experiments of Lavoifar. Further Expe- 

 riments. Experiments of Mr. Tennant.The Diamond proved to be 

 cryftallized Charcoal. 



CHAP. XL V. page 287. 

 The Strufture of the Earth. 



The Curiojity of Man on this Topic limited by the Weaknefs of his 

 Powers. The Body of the Earth difpofed [in Strata. Declivities of 

 Mountains. Difpojition and Order of the Strata. Caldy IJland.' 

 Where Metals are ufually found. Probable State of the Earth at its 

 Creation. Lavas by nuhich Alterations would be produced. FoJJil 

 Shells, &c. accounted for. Formation cf If.ands, &c. Other Irre- 

 gularities of the Earth's Surface explained, 



PjB-i CHAP. 



