14: CONTENTS. 



PAGB 



CHAPTER IV. ESTABLISHMENT OF THE DISTINCTION OF 

 SYSTEMS OF CRYSTALLIZATION. WEISS AND MOHS 326 



CHAPTER V. RECEPTION AND CONFIRMATION OF THE DIS- 

 TINCTION OF SYSTEMS OF CRYSTALLIZATION. 



Diffusion of the Distinction of Systems 330 



Confirmation of the Distinction of Systems by the Optical Properties of 



Minerals. Brewster 331 



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 



CHAPTER IX. ATTEMPTS AT THE REFORM OF MINERALO- 

 GICAL SYSTEMS. SEPARATION OF THE CHEMICAL AND 

 NATURAL HISTORY METHODS. 



Seel. 1. Natural History System of Mohs 344 



Sect. 2. Chemical System of Berzelius and others 347 



Sect. 3. Failure of the Attempts at Systematic Eeform 349 



Sect. 4. Keturn to Mixed Systems with Improvements 351 



CLASSIFICA TOR Y SCIENCES 



BOOK XVI. 

 HISTORY OF SYSTEMATIC BOTANY AND ZOOLOGY. 



Introduction.. 357 



