[...] Were not the overture and close of the last finale in your copy of The Flying Dutchman corrected by a score specially revised by myself last year? In particular I entirely altered the instrumentation of the closing movement of the overture. Last year I sent the score containing this alteration to Uhlig, who wrote that he had sent it to you at Weimar together with a second score (which contained the revision of the rest of the instrumentation). [...]
Source: Letters of Richard Wagner, Vol. 1, selected and ed. Wilhelm Altmann, trans. M. M. Bozman (J. M. Dent & Sons, 1927), No. 235