That is to say, here something positive must still be added (and is in fact -- that is in reality -- added), in the same way something positive is added in the case of defining ' man ', namely ' rational '. Therefore we should not want to express by the term ' sensitive organism ' a privation, but only indicate the set of all (from past, present and future) organisms which are sensitive : also man is a member of this set.
Perhaps the differentia, by which apes distinguish themselves from all other sensitive organisms, is ' friendliness ', by which (if this ' difference ' is correct) they surely distinguish themselves from man (apes do not wage war against each other, that is, with their congeners) ( This differentia is here of course not seriously meant, but only as an expression of disgust as regards human self-satisfaction) ( Perhaps ' possessing self-satisfaction ' is a proper differentia to figure in the difinition of ' man ', instead of the differentia ' rational ' ).