 This is what has come to be known as Ockham’s problem (see King [1992], 51): how can the nature as instantiated retain its non-numerical unity? Scotus’s apparent solution is that the nature in itself has non-numerical unity, but that as existent in particulars it has, in each particular, numerical unity. Scotus thus – consistent with his basic insight – believes that the nature has two different sorts of extramental entity: