We cannot safely presume, I think, that he followed out any deductive principle or system; if he had done so, he would probably have indicated it. The decuple indication of general heads arose rather from comparison of propositions and induction therefrom. Under each of these ten heads, some predicate or other may always be applied to every concrete individual object, such as a man or animal. Aristotle proceeded by comparing a variety of propositions, such as were employed in common discourse or dialectic, and throwing the different predicates into _genera_, according as they stood in different logical relation to the Subject. The analysis applied is not metaphysical but logical; it does not resolve the real individual into metaphysical [Greek: a)rchai\] or Principles, such as Form and Matter; it accepts the individual as he stands, with his full complex array of predicates embodied in a proposition, and analyses that proposition into its logical constituents.[70] The predicates derive their existence from being attached to the First Subject, and have a different manner of existence according as they are differently related to the First Subject.[71] What is this individual, Sokrates? He is an _animal_. What is his Species? _Man_. What is the Differentia, limiting the Genus and constituting the Species? _Rationality_, _two-footedness_. What is his height and bulk? He is _six feet_ high, and is of _twelve stone_ weight. What manner of man is he? He is _flat-nosed_, _virtuous_, _patient_, _brave_. In what relation does he stand to others? He is a _father_, a _proprietor_, a _citizen_, a _general_. What is he doing? He is _digging his garden_, _ploughing his field_. What is being done to him? He is _being rubbed with oil_, he is _having his hair cut_. Where is he? _In the city_, _at home_, _in bed_. When do you speak of him? _As he is, at this moment_, _as he was, yesterday_, _last year_. In what posture is he? He is _lying down_, _sitting_, _standing up_, _kneeling_, _balancing on one leg_. What is he wearing? He _has a tunic_, _armour_, _shoes_, _gloves_. [Footnote 70: Aristot. Metaphys. Z. p. 1038, b. 15. [Greek: dichô=s u(pokei=tai, ê)\ to/de ti o)/n, ô(/sper to\ zô=|on toi=s pa/thesin, ê)\ ô(s ê( u(/lê tê=| e)ntelechei/a|.] The first mode of [Greek: u(pokei/menon] is what is in the Categories. For the second, which is the metaphysical analysis, see Aristot. Metaph. Z. p. 1029, a. 23: [Greek: ta\ me\n ga\r a)/lla tê=s ou)si/as katêgorei=tai, au(/tê de\ tê=s u(/lês. ô(/ste to\ e)/schaton kath' au(to\ ou)/te ti\ ou)/te poso\n ou)/te a)/llo ou)the/n e)sti.]