CHAPTER IX

.--ATTEMPTS AT THE REFORM OF MINERALOGICAL

SYSTEMS.--SEPARATION OF THE CHEMICAL AND NATURAL HISTORY METHODS.

_Sect._ 1. Natural History System of Mohs. 344 _Sect._ 2. Chemical System of Berzelius and others. 347 _Sect._ 3. Failure of the Attempts at Systematic Reform. 349 _Sect._ 4. Return to Mixed Systems with Improvements. 351

_CLASSIFICATORY SCIENCES._

## BOOK XVI.

HISTORY OF SYSTEMATIC BOTANY AND ZOOLOGY.

Introduction. 357 {15}

## CHAPTER I .--IMAGINARY KNOWLEDGE OF PLANTS. 358

## CHAPTER II .--UNSYSTEMATIC KNOWLEDGE OF PLANTS. 361

##