“…It is in his 1913 Critique of the Logical Principle of the Excluded Middle [20]/ [23] that Leśniewski first tried to prove, per reductionem ad absurdum, that no object is a "general object" (przedmiot ogólny). 5 Since the passage in which he sets out his proof is rather confusing, I quote it in its entirety: 6 I will assume that there is an object o g which is 'general' and corresponds to the 'individual objects' o 1 , o 2 , o 3 , ..., o n ; for every 'individual object' o k , one can always find some property 7 P k which is not common to all the 'individual' objects o 1 , o 2 , o 3 , ..., o n . On the basis of the above, the 'general object' o g does not possess the property P k (I).…”