all probability, it will appear that the nineteenth century
was the most revolutionary epoch by far that the history of thought has
known. And it owes this proud position to the fact that it was the epoch
in all history most fully subject to the dominant influence of inductive
science. Thanks to this influence, we of the new generation are able to
start out on a course widely divergent from the path of our
ancestors. Our leaders of thought have struggled free from the bogs
of superstition, and are pressing forward calmly yet with exultation
towards the heights.

APPENDIX

(p. 95). J. J. Thompson, D.Sc., LL.D., Ph.D., F.R.S.,etc., Electricity
and Matter, p. 75 ff., New York, 1904. The Silli-man Lectures, delivered
at Yale University, May, 1903.

(p. 96). Ibid., pp. 88, 89. 3 (p- 97)- Ibid., p. 89.

(p. 97). Ibid., p. 87.

(p. 102). George F. Kunz, "Radium and its Wonders," in the Review of
Reviews for November, 1903, p. 589.

(p. 105). E. Rutherford, Radio-Activity, p. 330, Cambridge, 1904.

(p. 106). Ibid., p. 330.

(p. 106). Compte Rendu, pp. 136, 673, Paris, 1903.

(p. 106). Revue Scientifique, April 13, 1901. 10 (p. 106). Compte Rendu,
p. 136, Paris, 1903.

(p. 108). J. J. Thompson, Electricity and Matter, p. 162, New York,
1904.

(p. --). E. Rutherford, Radio-Activity, p. 340, Cambridge, 1904.

(p. 185). Dr. Duclaux, who was one of Pasteur's chief assistants, and
who succeeded him in the directorship of the Institute, died in 1903. He
held a professorship in the University of Paris during the later years
of his life, and his special studies had to do largely with the chemical
side of bacteriology.

(p. 217). Lord Kelvin's estimate as quoted was expressed to the writer
verbally. I do not know whether he has anywhere given a similar written
verdict.

A LIST OF SOURCES

I.--PERIOD COVERED BY VOLUME I.

An ax agoras. See vol. i., p. 240.

Archimedes. See vol. i., p. 196.

Many of the works of Archimedes are lost, but the following have come
down to us: (1) On the Sphere and Cylinder; (2) The Measure of the
Circle; (3) Conoids and Spheroids; (4) On Spirals; (5) Equiponderants
and Centres of Gravity; (6) The Quadrature of the Parabola; (7) On
Bodies Floating in Liquids; (8) The Psammites; (9) A Collection of
Lemmas.

Aristarchus. See vol. i., p. 212.

Magnitudes and Distances of the Sun and Moon is the only sur