[108] Condillac, Langue des Calculs, p. 7.
[109] Locke, Essay, iii. 3.
[110] Id. ib. iv. 17.
[111] Loc. cit. § 8.
[112] Id. ib. iv. 4, §§ 6 sqq.
[113] Berkeley, Of the Principles of Human Knowledge, § 142.
[114] Hume, Treatise of Human Nature, i. 1. 7 (from Berkeley, op. cit., introd., §§ 15-16).
[115] Essay, iv. 17, § 3.
[116] Hume, Treatise of Human Nature, i. 3. 15.
[117] Mill, Examination of Sir William Hamilton’s Philosophy, cap. 17.