H.F. Chorley, Thirty Years' Musical Recollections (Hurst and Blackett, London 1862), Vol. II, p. 177.
B. Lumley, Reminiscences of the Opera (Hurst and Blackett, London 1864), p. 382. The quotation of this passage in Jachmann, trans. Trechman, Wagner and his first Elisabeth, pp. 39-40, has lost the force of the original.