=62.= A striking feature of the Platonic dialogues is that their results are usually negative. First the opinions of the crowd, then those of Socrates’ contemporaries the ‘sophists’ and of the other Socratic schools are subjected to a cross-examination, under which they are one and all shewn to be unreasonable. This cross-examination is quite in the Socratic spirit, and is before all things a mental gymnastic, training the dialectician to observe with keener eye and to discuss with apter tongue than his fellows. Gradually there emerges from a mass of doubts something like a positive theory that Plato is prepared to adopt. The true reasoning is that of induction from the particular to the general, from the individual to the class. In the class name we come upon the true being of the individual, and by a right definition of it we discern what each thing really is. The ‘idea,’ which corresponds to the class name, is alone really existent; the individual is a more or less imperfect imitation of it (μίμησις). In this way Plato found what seemed to him a solution of a difficulty which Socrates hardly felt, that of explaining the participation (μέθεξις) of the particular in the general (ὑπόθεσις or ἰδέα). Thus where ordinary men see ‘horses,’ and Antisthenes holds that they are right, Plato sees ‘horsiness,’ or the idea of ‘horse.’ In the language of medieval philosophy Plato is a _realist_, that is, one who holds that our Ideas are more than what men mean when they say ‘mere ideas’; that they are Realities, and have their being in a truly existing world; and that in knowing them we know what _is_. But just as Plato holds that general conceptions are alone true and real, so he necessarily maintains that objects perceivable by the senses are only half-real, and that the ordinary man lives in a world of illusions. Thus the thoughts of the philosopher are separated by an abyss from the world in which men live and die. [Sidenote: God and the soul.] =63.= Upon the basis of the individual ‘ideas’ Plato builds up by a process of classification and induction higher and smaller classes of ideas, until we begin to see the vision of a single idea, a class which includes all classes, a supreme ‘being’ from which all being is derived. This highest idea is variously suggested by the names ‘the Good,’ ‘the Beautiful,’ ‘the One.’ By a sudden transformation it becomes the Creator (δημιουργός) of the universe. Containing in itself all being, it needs for its operation some kind of formless and inert matter; for this the name ἄπειρον, ‘the unlimited,’ is taken from Anaximander. The whole created universe may be considered as the joint production of the ‘idea’ and the ‘unlimited’; and the cosmology of Anaxagoras, ‘all things were together, and mind came and ordered them,’ is substantially justified. The world thus created is both good and beautiful, for it is made by a good Creator on the best of patterns.