CHAPTER VIII

.--THE DOCTRINE OF FINAL CAUSES IN PHYSIOLOGY.

_Sect._ 1. Assertion of the Principle of Unity of Plan. 482 _Sect._ 2. Estimate of the Doctrine of Unity of Plan. 487 _Sect._ 3. Establishment and Application of the Principle of the Conditions of Existence of Animals.--Cuvier. 492

_THE PALÆTIOLOGICAL SCIENCES._

## BOOK XVIII.

HISTORY OF GEOLOGY.

Introduction. 499

_DESCRIPTIVE GEOLOGY._

##