A close investigation of Wittgenstein’s MS 104, which contains the so-called Prototractatus, has shown that the manuscript originally contained an additional folio that was later cut out and is now missing. The content of this missing folio could be partly reconstructed by a faint inverse imprint that it has left behind on page 2. The paper discusses the consequences of this discovery for the interpretation of the beginning and early formation of the Prototractatus, including the introduction and role of the (...) numbering system. The paper also provides a transcription of the deepest visible textual layers of the first conception of the picture theory. (shrink)