December, 1887.

[1] I have indicated the new chapters and sections by printing them in italics in the Table of Contents.

TABLE OF CONTENTS.[*]

* Chapters and sections which are nearly or entirely new are printed in italics.

PART I.

PHYSICAL FOUNDATIONS OF THE SCIENCE OF PROBABILITY. Chh. I–V.

[CHAPTER I.]

THE SERIES OF PROBABILITY.

§§ 1, 2. Distinction between the proportional propositions of Probability, and the propositions of Logic.

3, 4. The former are best regarded as presenting a series of individuals,