[136] See Ueberweg, System of Logic and History of Logical Doctrines, § 34.
[137] Drei Bücher der Logik, 1874 (E.T., 1884). The Book on Pure Logic follows in essentials the line of thought of an earlier work (1843).
[138] Logic, Eng. trans. 35 ad. fin.
[139] Logic, Introd. § ix.
[140] For whom see Höffding, History of Modern Philosophy, Eng. trans., vol. ii. pp. 122 sqq.; invaluable for the logical methods of modern philosophers.
[141] Wissenschaft der Logik (1812-1816), in course of revision at Hegel’s death in 1831 (Werke, vols. iii.-v.), and Encyklopädie der philosophischen Wissenschaften, i.; Die Logik (1817; 3rd ed., 1830); Werke, vol. vi., Eng. trans., Wallace (2nd ed., 1892).
[142] The Principles of Logic (1883).
[143] Logic, or The Morphology of Thought (2 vols., 1888).
[144] Logic, Pref. pp. 6 seq.
[145] Id. vol. ii. p. 4.