CONTENTS.

ON THE FOURFOLD ROOT OF THE PRINCIPLE
OF SUFFICIENT REASON.

CHAP. PAGE
Translator's Preface[v]
Author's Preface to the Second Edition[xvii]
Editor's Preface to the Third Edition[xx]
Editor's Preface to the Fourth Edition[xxviii]
I.Introduction[1]
II.General Survey of the most important views hitherto held concerning the Principle of Sufficient Reason[6]
III.Insufficiency of the Old and outlines of a New Demonstration[28]
IV.On the First Class of Objects for the Subject, and that form of the Principle of Sufficient Reason which predominates in it[31]
V.On the Second Class of Objects for the Subject and that form of the Principle of Sufficient Reason which predominates in it[114]
VI.On the Third Class of Objects for the Subject and that form of the Principle of Sufficient Reason which predominates in it[153]
VII.On the Fourth Class of Objects for the Subject, and that form of the Principle of Sufficient Reason which predominates in it[165]
VIII.General observations and results[177]

ON THE WILL IN NATURE.

Preface to the Second Edition[193]
Editor's Preface to the Third Edition[213]
Editor's Preface to the Fourth Edition[214]
Introduction[215]
Physiology and Pathology[224]
Comparative Anatomy[252]
Physiology of Plants[281]
Physical Astronomy[305]
Linguistic[322]
Animal Magnetism and Magic[326]
Sinology[359]
Reference to Ethics[372]
Conclusion[378]

ON THE FOURFOLD ROOT
OF THE
PRINCIPLE OF SUFFICIENT REASON.

A PHILOSOPHICAL TREATISE.

Ναὶ μὰ τὸν ἁμετέρᾳ ψυχᾷ παραδόντα τετρακτύν,

Παγὰν ἀενάου φύσεως ῥιζώματ' ἔχουσαν.