 How could we possibly know that something is a Tractarian object? Wittgenstein has little or nothing to say on this topic in the Tractatus, and yet it is clear from his retrospective remarks that during the composition of the Tractatus he did think it possible in principle to discover the Tractarian objects (See AM, 11 and EPB, 121). So it seems worth asking by what means he thought such a discovery might be made. 