CONTENTS. xvii 



CHAP. IX. 



Zinc 312 



CHAP. X. 



Regulus of Antimony 324 



O H A P. XI. 



Regulus of Arfenic 327 



CHAP. XII. 



Bifmuth 332 



CHAP. XIII. 

 Cobalt 335 



CHAP. XIV. 



Nickel 341 



CHAP. XV. 



Regulus of Manganefe 345 



CHAP. XVI. 



Siderite - 354 



CHAP. XVII. 



Molybdena. Molybdena membranacea Cronjl. 

 154. WaJJerbley of the Germans 357 



C H A P. XVIII. 



Of the Tungflenic Acid 360 



CHAP. XIX. 



Saturnite 361 



CHAP. XX. 



Reflexions on the nature of Cobalt, Nickel, and 

 Manganefe 362 



APPENDIX HI. 



Geological Obfervations 373 



TABLE 



