The place of the Meno in the series is doubtfully indicated by internal evidence. The main character of the Dialogue is Socrates; but to the 'general definitions' of Socrates is added the Platonic doctrine of reminiscence. The problems of virtue and knowledge have been discussed in the Lysis, Laches, Charmides, and Protagoras; the puzzle about knowing and learning has already appeared in the Euthydemus. The doctrines of immortality and pre-existence are carried further in the Phaedrus and Phaedo; the distinction between opinion and knowledge is more fully developed in the Theaetetus. The lessons of Prodicus, whom he facetiously calls his master, are still running in the mind of Socrates. Unlike the later Platonic Dialogues, the Meno arrives at no conclusion. Hence we are led to place the Dialogue at some point of time later than the Protagoras, and earlier than the Phaedrus and Gorgias. The place which is assigned to it in this work is due mainly to the desire to bring together in a single volume all the Dialogues which contain allusions to the trial and death of Socrates. ***** ON THE IDEAS OF PLATO. Plato's doctrine of ideas has attained an imaginary clearness and definiteness which is not to be found in his own writings. The popular account of them is partly derived from one or two passages in his Dialogues interpreted without regard to their poetical environment. It is due also to the misunderstanding of him by the Aristotelian school; and the erroneous notion has been further narrowed and has become fixed by the realism of the schoolmen. This popular view of the Platonic ideas may be summed up in some such formula as the following: 'Truth consists not in particulars, but in universals, which have a place in the mind of God, or in some far-off heaven. These were revealed to men in a former state of existence, and are recovered by reminiscence (anamnesis) or association from sensible things. The sensible things are not realities, but shadows only, in relation to the truth.' These unmeaning propositions are hardly suspected to be a caricature of a great theory of knowledge, which Plato in various ways and under many figures of speech is seeking to unfold. Poetry has been converted into dogma; and it is not remarked that the Platonic ideas are to be found only in about a third of Plato's writings and are not confined to him. The forms which they assume are numerous, and if taken literally, inconsistent with one another. At one time we are in the clouds of mythology, at another among the abstractions of mathematics or metaphysics; we pass imperceptibly from one to the other. Reason and fancy are mingled in the same passage. The ideas are sometimes described as many, coextensive with the universals of sense and also with the first principles of ethics; or again they are absorbed into the single idea of good, and subordinated to it. They are not more certain than facts, but they are equally certain (Phaedo).