I.
[Ideas], Plato’s, differ from Pythagorean Number, i. [10];
identified by Plato with the Pythagorean symbols, [348], iii. [71 n.], [368];
differ from Demokritean atoms, i. [72];
the definitions Sokrates sought for, [453];
Plato assumed the common characteristic, by objectivising the word itself, [ ib.];
doctrine derived its plausibility from metaphors, [343];
soul’s immortality rests on assumption of, ii. [412];
reminiscence of the, iii. [13];
as Forms, ii. [412];
the only causes, [396];
formal, [408 n.];
logical phantoms as real causes, [404 n.];
truth resides in, [411];
alone exclude contrary, [7 n.];
unchangeable, iii. [246 n.], iv. [50];
Herakleitean flux not true of, iii. [320];
partly changeable and partly unchangeable, [228];
disguised in particulars, iv. [3 n.];
fundamental distinction of particulars, and, [219];
alone knowable, [49];
opinion, of what is between ens and non-ens, [ib.];
assumption of, as separate entia, ii. [396], [403];
great multitude of, [410];
characteristics of world of, iii. [63];
Ideas separate from, but participable by, sensible objects, [59];
objections, [ 60-7];
the genuine Platonic theory attacked, [68];
none of some objects, [60];
how participable by objects, [63], [65], [72], iv. [138];
not fitted on to the facts of sense, iii. [78];
Aristotle partly successful in attempt, [76].;
analogous difficulty of predication, i. [169];
“the third man,” iii. [64 n.];
not merely conceptions, [64], [73];
not mere types, [65];
not cognizable, since not relative to ourselves, [ib.], [72];
gods have Idea of cognition, [67], [68 n.];
dilemma, ideas exist or philosophy impossible, [68];
intercommunion of some forms, [207], [250 n.];
analogy of letters and syllables, [208];
what forms, determined by philosopher, [ ib.];
of non-ens, and proposition, opinion, judgment, [213], [214];
of Diversum pervades all others, [209];
τῶν ἀποφάσεων, [238 n.];
of Animal, iv. [223], [235 n.], [263];
kosmos on pattern of, [223];
action on Materia Prima, [238];
of the elements, [239];
of insects, &c., iii. [195 n.];
of names and things nameable, [286 n.], [289], [326 n.];
names fabricated by lawgiver on type of, [287], [290], [325];
names the essence of things, [324 n.];
doctrine about classification not necessarily connected with, [345];
of Beauty exclusively presented in Symposion, [18];
of Good, approximation of primum amabile, ii. [192];
training to ascend to the idea of good, iv. [61], [66];
comparison of idea of good to sun, [63], [64];
of Good, in Phædon, Anaxagoras’ nous, ii. [412];
known to the rulers alone, iv. [212];
left unsolved, [213];
the contemplation of, by dialectic, [75];
reluctance to undertake active duties, of those who have contemplated, [70];
philosopher lives in region of, sophist in region of non-ens, iii. [208], iv. [48];
little said of, in Menon, ii. [253], [254 n.];
postulated in Timæus, iv. [220];
discrepancy of Sophistês and other dialogues, iii. [244];
the idealists’ doctrine the same as Plato’s in Phædon, &c., [ib.], [246];
Phædrus, Phædon, and Timæus compared, iv. [239 n.];
Plato’s various views, ii. [404], i. [119];
the last, [120];
Aristotle on, [360 n.], ii. [192], [193 n.], [410 n.], iii. [76], [245], [365 n.], [367], iv. [214 n.], i. [120 n.];
Sophistês approximates to Aristotle’s view, iii. [247];
generic and analogical aggregates, ii. [48], [193 n.], iii. [365];
Antisthenes and Diogenes on, i. [163];
the first protest of Nominalism against Realism, [164];
see [Particulars], [Phenomena], [Universal].
[Ideal], to Plato the only real, ii. [89].
[Idealists], iii. [201];
meaning of ens, [231];
argument against, [204], [225], [244];
doctrine of, the same as Plato’s in Phædon, &c., [ ib.], [246].
[Identity], personal, ii. [11], [25], iii. [6];
and contradiction, principle of, [101].
Ἰδιώτης distinguished from φιλόσοφος, iv. [104 n.];
τεχνίτης, ii. [272 n.]
[Ignorance], mischiefs of, ii. [12];
depend on the subject-matter, [14];
to hurt knowingly, better than ignorantly, [58], [59];
evil done by bad man unwillingly, by good wilfully, [61];
not pleasure, the cause of wrongdoing, [294];
mistaking itself for knowledge, the worst evil, iii. [197];
see [Knowledge].
[Imitator], logical classification of, iii. [215];
of the wise man, sophist is, [216];
poets’ mischievous imitation of imitation, iv. [91].
[Immortality], beliefs as to partial, ii. [385 n.];
popular Greek belief, [427];
metempsychosis a general element in all old doctrines, [425 n.];
of rational soul only, iv. [243];
of all three parts of soul? ii. [385];
Plato’s demonstration rests on assumption of ideas, [412];
includes pre-existence of all animals, and metempsychosis, [414];
fails, [423], [428], iii. [15];
leaves undetermined mode of pre-existence and post-existence, ii. [424];
was not generally accepted, [426];
Xenophon’s doctrine, [420 n.];
Aristotle’s, [ ib.];
common desire for, iii. [6];
attained through mental procreation, beauty the stimulus, [ib.];
only metaphorical in Symposion, [17].