Such is the theory of Mr. James Mill. Its great peculiarity is that it neither includes nor alludes to Abstraction. It admits in Classification nothing more than the one common name associated with an aggregate indefinite and indistinct, of similar concrete individuals. I shall now consider the manner {276} in which the Greek philosophers of the fourth century B.C. dealt with the same subject, and how far they merit the censure of having imported unnecessary mystery into it. It is impossible to understand Plato unless we take our departure from his master Sokrates. Now it is precisely in regard to Classification, and the meaning and comprehension of general terms, that the originality and dialectical acuteness of Sokrates were most conspicuously manifested. He was the first philosopher (as Aristotle[c] tells us) who set before himself the Universal as an express object of investigation,--and who applied himself to find out and test the definition of universal terms. He wrote nothing; but he passed most part of his long life in public, and in talking indiscriminately with every one. Oral colloquy, and cross-examining interrogation, were carried by him to a pitch of excellence never equalled. Not only did he disclaim all power of teaching, but he explicitly avowed his own ignorance; professing to be a mere seeker of truth from others who knew better, and to be anxious only for answers such as would stand an accurate scrutiny. To this peculiar scheme--the topics on which he talked were adapted: for he avoided all recondite themes, and discussed only matters relating to man and society: such as What is the Holy? What is the Unholy? What are the Beautiful and the Mean the Just and Unjust? Temperance? Madness? Courage? Cowardice? A City? A man fit for citizenship? Command of Men? A man fit for commanding men? Such is the specimen-list given by Xenophon[d] of the themes chosen by Sokrates. We see that they are all general, and embodied in universal terms. But the terms as well as the themes were familiar to all: every man believed himself thoroughly to understand the meaning of the former--every one had convictions ready-made and decided on the latter. When Sokrates first opened the colloquy, respondents were surprised to be questioned about such subjects, upon which they presumed {277} that every one must know as well as themselves. But this confidence speedily vanished when they came to be tested by inductive[e] interrogatories: citation of appropriate particulars, included or not included in the generalities which they laid down. The result proved that they could not answer the questions without speedily contradicting themselves: that they did not understand the comprehension of their own universal terms: and that upon all these matters, on which they talked so confidently, they had never applied themselves deliberately to learn, nor could they say how their judgments had been acquired or certified.[f]