23 – Teleology is the doctrine that things exist for some purpose. A teleological cause, which is the same as “final cause” or “end,” is the purpose involved in an action. It is contrasted with mechanical or efficient cause. A trolley car is moving and a man runs to catch it. Electricity is the mechanical cause of the movement of the car. The purpose of the man is the teleological cause of his running; the strength in his legs is the mechanical or efficient cause of his running. 24 – Atoms differ primarily in form (ἰδέα); size is referred in part to form. 25 – These all reduce to form,――see above. 26 – Windelband, _Hist. of Ancient Phil._, pp. 183–189. 27 – Read Wordsworth, _Dion_. 28 – B. Jowett, _Dialogues of Plato_, trans. into English with analyses and introductions, 4 vols. See p. 158 for selections from the dialogues made by Jowett for English readers. 29 – Goethe. 30 – For the distinction between perception and conception, see p. 83. 31 – Read Wordsworth’s _Ode on Intimations of Immortality_. 32 – Read Edmund Spenser, _Hymn in Honor of Beauty_; Emerson, _Essay on Love_, also the poem on _Initial, Dæmonic, and Celestial Love_; Bacon, _Essay on Love_; Patmore, _Angel in the House_; Sill, _The Two Aphrodites_. 33 – B. I. Wheeler, _Life of Alexander the Great_. 34 – Read Walter Pater, _Marius the Epicurean_; Hicks, _Stoic and Epicurean_, p. 184, for the _Golden Maxims_ of Epicurus; Teuffel, _History of Roman Literature_, pp. 83–86. 35 – Windelband, _Hist. of Phil._, p. 183. 36 – Adamson, _The Development of Greek Philosophy_, p. 267. 37 – Professor C. P. Parker. 38 – A. Hicks, _Stoic and Epicurean_, pp. 322 ff. 39 – Read Grote, _Plato_, vol. iii, pp. 482–490, for the interesting sophistical problems of the Liar, the Person Disguised under a Veil, Electra, Sorites, Cornutus, and the Bald Man. 40 – For a statement of these tropes, see Weber, _Hist. of Phil._, p. 153. 41 – Ueberweg, _Hist. of Phil._, vol. i, p. 216. 42 – Read Dill, _Roman Society_, first three chapters. 43 – Read Charles Kingsley, _Hypatia_, a novel. 44 – Hatch, _Hibbert Lectures_, 1888, p. 182. 45 – Harnack, _Outlines of the Hist. of Dogma_, p. 120. 46 – Windelband, _Hist. of Ancient Phil._, p. 357. 47 – Harnack, _Outlines of the History of Dogma_, p. 159. 48 – Read Rossetti, _Shadow of Dante_, pp. 9–14; Karl Witte, _Essays on Dante_, pp. 99 ff. 49 – Read Eucken, _Problem of Human Life_, pp. 219–221, 232, 236, 245–248; Turner, _Hist. of Philosophy_, p. 226; De Wulf, _Hist. of Mediæval Phil._, pp. 90–98; Harnack, _Hist. of Dogma_, vol. v, pp. 3–6. 50 – Eucken, _Problem of Human Life_, p. 247. 51 – Harnack, _Hist. of Dogma_, vol. v, p. 3.