The step from Rienzi to Der fliegende Hollander is without parallel in the history of music, and would be inexplicable if Rienzi contained nothing good and if Der fliegende Hollander did not contain many reminiscences of the decline of Italian opera; but it is noticeable that in this case the lapses into vulgar music have a distinct dramatic value.
There are lapses and flaws, and Natty is made to say things which only Cooper, in his most verbosely didactic vein, could have uttered.
But such incidental lapses are found to correct themselves by the consequences in which they involve us, and they have no power to shake our trust in the general validity of reason.
Editors of journals remove the slips of the pens of their contributors; editors of books, nowadays usually in footnotes, the similar lapses of their authors.
Certain lapses from grammatical correctness and metrical regularity that we find in the poems of Shelley are undoubtedly due to the author, though the number of these has been reduced (as Mr Buxton Forman has pointed out) with our improved knowledge of the sources of the text.