[6] "Essay", Bk. 2, Chap. 23, § 1.
[7] "Essay," Bk. 4, Chap. 2, § 14; Bk. 4, Chap. 4 and Chap. 11.
[8] Ibid., Bk. 2, Chap. 12, § 6; Bk. 2, Chap. 23, § 1, with note (Phila., 1846, p. 183, et seq.).
[9] See note to § 1, Chap. 23, Bk. 2.
[10] Bk. 4, Chap. 11, et passim.
[11] "I confess there is another idea, which would be of general use for mankind to have, as it is of general talk, as if they had it; and that is the idea of substance, which we neither have, nor can have, by sensation or reflection." Bk. 1, Chap. 4, § 18 of the "Essay."
[12] "Essay," Bk. 4, Chaps. 3, 4 and 11.
[13] Lectures on Metaph., VIII, N. Y., 1880, p. 102.
[14] Herbert Spencer, "First Principles." Part I, Chap. V, § 31, N. Y., 1888, p. 108.
[15] "First Principles." Part I, Chap. V, § 27.