From the Category of Quantity, Aristotle proceeds next to that of Relation;[49] which he discusses in immediate sequence after Quantity, and before Quality, probably because in the course of his exposition about Quantity, he had been obliged to intimate how closely Quantity was implicated with Relation, and how essential it was that the distinction between the two should be made clear. [Footnote 49: Ibid. a. 36, seq.] _Relata_ ([Greek: ta\ pro/s ti]--_ad Aliquid_) are things such, that what they are, they are said to be _of other things_, or are said to in some other manner _towards something else_ ([Greek: o(/sa au)ta\ a(/per e)sti\n **e(te/rôn ei)=nai le/getai, ê)\ o(pôstou=n a)/llôs pro\s e(/teron]). Thus, that which is greater, is said to be greater _than another_; that which is called double is called also double _of another_. Habit, disposition, perception, cognition, position, &c., are all _Relata_. Habit, is habit _of something_; perception and cognition, are always _of something_; position, is position _of something_. The Category of Relation admits contrariety in some cases, but not always; it also admits, in some cases, graduation, or the more or less in degree; things are more like or less like to each other.[50] All _Relata_ are so designated in virtue of their relation to other _Correlata_; the master is master _of a servant_--the servant is servant _of a master_. Sometimes the _Correlatum_ is mentioned not in the genitive case but in some other case; thus cognition is cognition _of_ the _cognitum_, but _cognitum_ is _cognitum by_ cognition; perception is perception _of_ the _perceptum_, but the _perceptum_ is _perceptum by_ perception.[51] The correlation indeed will not manifestly appear, unless the Correlate be designated by its appropriate term: thus, if the wing be declared to be wing _of a bird_, there is no apparent correlation; we ought to say, the wing is wing _of the winged_, and the winged is winged _through_ or _by_ the wing; for the wing belongs to the bird, not _quâ bird_, but _quâ winged_,[52] since there are many things winged, which are not birds. Sometimes there is no current term appropriate to the Correlate, so that we are under the necessity of coining one for the occasion: we must say, to speak with strict accuracy, [Greek: ê( kephalê/, tou= kephalôtou= kephalê/] not [Greek: ê( kephalê/, tou= zô=|ou kephalê/]; [Greek: to\ pêda/lion, tou= pêdaliôtou= pêda/lion], not [Greek: to\ pêda/lion, ploi/ou pêda/lion].[53] [Footnote 50: Aristot. Categ. p. 6, b. 20.] [Footnote 51: Ibid. b. 28-37.]