Remarks on Colour line that 'There is no such thing as phenomenology, though there are phenomenological problems.' He was content to regard Goethe's observations as a kind of logic or geometry. Wittgenstein took his examples from the Runge letter included in the "Farbenlehre", e.g. "White is the lightest colour", "There cannot be a transparent white", "There cannot be a reddish green", and so on. The logical status of these propositions in Wittgenstein's investigation, including their relation to physics, was discussed in Jonathan Westphal's "Colour: a Philosophical Introduction" (1991). Although "Remarks on Colour" is considered difficult on account of its fragmentation, his last work,
Seibel grapes only four parent grapes: two European (Vitis Vinifera) grapes: Aramon and Alicante Bouchet … one wild American grape: Jaeger 70 (V. Rupestris x V.Lincicumii)… and one rootstock, AxR1, which was created by crossing Aramon with a wild American Vitis Rupestris. Although Seibel bred tens of thousands of grapes, he did so almost entirely by continually crossing and re-crossing his original varieties, all of which were descended from the original four vines, so the basic gene pool of his collection remained largely unchanged. Almost all later grapevine hybridizers, such as Bertille Seyve and his father-in-law Victor Villard, would simply breed one