VIII CONTENT'S. 



CHAPTRR VII. Of Classification, as subsidiary to 

 Induction. 



PAGE 



1. Classification, as here treated of, wherein different from the 



classification implied in naming . . . 209 



2. Theory of natural groups .... 301 



3. Are natural groups given by type, or by definition? . 300 



4. Kinds are natural groups . . . .310 



5. How the names of Kinds should be constructed . .316 



CHAPTER VIII. Of Classification by Series. 



1. Natural groups should be arranged in a natural series . 321 



2. The arrangement should follow the degrees of the main 



phenomenon . . . . .322 



3. which implies the assumption of a type-species . 324 



4. How the divisions of the series should be determined . 325 



5. Zoology affords the completest type of scientific classification 327 



BOOK V. 

 ON FALLACIES. 



CHAPTER I. Of Fallacies in general. 



1. Theory of fallacies a necessary part of logic . . 333 



2. Casual mistakes are not fallacies . . . 335 



3. The moral sources of erroneous opinion, how related to the 



intellectual . . . .336 



CHAPTER II. Classification of Fallacies. 



1. On what criteria a classification of fallacies should be 



grounded 339 



2. The five classes of fallacies . . 340 



3. The reference of a fallacy to one or other class is sometimes 



arbitrary ..... 344 



