argues similarly: "The novel's opening line, 'I am, therefore I think,' by reversing the Cartesian principle of knowledge as intelligent command over experience, announces the futility of the enterprise in advance" (43). 4. "Das Mystische," or "the mystical," is Wittgenstein's term for that which falls outside the limits of language or knowledge. As he puts it in the Tractatus: "There is indeed the inexpressible. This shows itself; it is the mystical" (187). 5. The concept of "intimations" carries strong romantic overtones-witness Wordsworth's classic "Intimations of Immortality from Recollections of Early Childhood." This term recurs a few times in Birchwood and the science tetralogy in close connection to the (equally romantic) notion of epiphany. D ' H O K E R • 53 7. I disagree with Imhof and Berensmeyer, who read the first page of Doctor Copernicus as depicting Nicolas's fall from grace at the introduction of language (Imhof, John Banville 78-81; Berensmeyer 133).