CHAPTER VIII

. _Of Classification by Series._

§ 1. Natural groups should be arranged in a natural series 284

2. The arrangement should follow the degrees of the main phenomenon 285

3. --which implies the assumption of a type-species 287

4. How the divisions of the series should be determined 288

5. Zoology affords the completest type of scientific classification 289

## BOOK V.

ON FALLACIES.

##