Notes

¹Cf. M. le Roy: “Science et Philosophie,” Revue de Métaphysique et de Morale, 1901.

²For .—[TR.]

³Logic, c. viii., cf. Definitions, §5–6.—[TR.]

⁴Revue de Métaphysique et de Morale, t. vi., pp. 1–13, January, 1898.

⁵V. Past and Present, end of Chapter I., Book II.—[TR.]

⁶Clerk-Maxwell imagined some supernatural agency at work, sorting molecules in a gas of uniform temperature into (a) those possessing kinetic energy above the average, (b) those possessing kinetic energy below the average.—[TR.]

⁷This chapter is mainly taken from the prefaces of two of my books—Théorie Mathématique de la lumière (Paris: Naud, 1889), and Électricité et Optique (Paris: Naud, 1901).

⁸We may add that $U$ will depend only on the $q$ parameters, that $T$ will depend on them and their derivatives with respect to time, and will be a homogeneous polynomial of the second degree with respect to these derivatives.

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