Issues : Authentic corrections of FE
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b. 37-40
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composition: Op. 10 No 8, Etude in F major
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The fingering given in the main text – in bars 37-38 – was added by Chopin in a proofreading of FE (→GE,EE). In the latter, Fontana completed it in these and two next bars. category imprint: Differences between sources issues: EE revisions , Authentic corrections of FE |
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b. 37
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composition: Op. 10 No 8, Etude in F major
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The first R.H. slur in A is probably drawn imprecisely. The distinctly different slurs in FE (→GE,EE) are most likely the result of Chopin's correction. category imprint: Graphic ambiguousness; Differences between sources |
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b. 40
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composition: Op. 10 No 8, Etude in F major
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category imprint: Differences between sources; Corrections & alterations issues: Authentic corrections of FE |
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b. 41
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composition: Op. 10 No 8, Etude in F major
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Two fingering digits given in the main text come from FE (→GE,EE). Fontana repeated them in EE also at the beginning of the next group of 4 semiquavers. category imprint: Differences between sources issues: EE revisions , Authentic corrections of FE |
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b. 42
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composition: Op. 10 No 8, Etude in F major
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In A there is no category imprint: Differences between sources issues: Omission of current key accidentals , Authentic corrections of FE |
while proofreading 
before the 1st semiquaver in the L.H., yet it is before the 6th note. However, there are no doubts that both notes are meant to be b. The error was corrected in a proofreading of 
before the last semiquaver (f