Chapter Vi.--Correction of the Law of the Same Angle for the Same

SUBSTANCE.

Discovery of Isomorphism.--Mitscherlich. 334 Dimorphism. 336

CHAPTER VII.--ATTEMPTS TO ESTABLISH THE FIXITY OF OTHER PHYSICAL PROPERTIES.--WERNER. 336

SYSTEMATIC MINERALOGY.

CHAPTER VIII.--ATTEMPTS AT THE CLASSIFICATION OF MINERALS.

Sect. 1. Proper Object of Classification. 339 Sect. 2. Mixed Systems of Classification. 340