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

##