vm CONTENTS OF THE THIRD VOLUME. 



PACK 



CHAPTER V. RECEPTION AND CONFIRMATION OF THE DIS- 

 TINCTION OF SYSTEMS OF CRYSTALLIZATION. 



Diffusion of the Distinction of Systems . . . .241 

 Confirmation of the Distinction of Systems by the Optical 



Properties of Minerals. Brewster .... 242 

 CHAPTER VI. CORRECTION OF THE LAW OF THE SAME 



ANGLE FOR THE SAME SUBSTANCE. 

 Discovery of Isomorphism. Mitscherlich . . . 245 



Dimorphism 248 



CHAPTER VII. ATTEMPTS TO ESTABLISH THE FIXITY OF 



OTHER PHYSICAL PROPERTIES. WERNER . . 250 



SYSTEMATIC MINERALOGY. 



CHAPTER VIII. ATTEMPTS AT THE CLASSIFICATION OF 

 MINERALS. 



Sect. 1. Proper Object of Classification . . . 253 



Sect. 2. Mixed Systems of Classification . . . 256 



CHAPTER IX. ATTEMPTS AT THE REFORM OF MINERALO- 

 GICAL SYSTEMS. SEPARATION OF THE CHEMICAL AND 

 NATURAL HISTORY METHODS. 



Sect. 1. Natural History System of Mohs . . . 262 

 Sect. 2. Chemical System of Berzelius and others . 267 

 Sect. 3. Failure of the Attempts at Systematic Reform . 270 

 Sect. 4. Return to Mixed Systems with Improvements 275 



CLA SSIFICA TOR Y SCIENCES. 



BOOK XVI. 

 HISTORY OF SYSTEMATIC BOTANY AND ZOOLOGY. 



Introduction . . . . . . . . 286 



CHAPTER I. IMAGINARY KNOWLEDGE OF PLANTS . 287 

 CHAPTER II. UNSYSTEMATIC KNOWLEDGE OF PLANTS . 292 

 CHAPTER III FORMATION OF A SYSTEM OF ARRANGE- 

 MENT OF PLANTS. 



Sect. 1. Prelude to the Epoch of Cassalpinus . . 306 

 Sect. 2. Epoch of Cassalpinus. Formation of a System of 



Arrangement 312 



