Op 1 no 1

• Bar 1
  The original edition lacks the two-line epigraph from Lermontov's poem The Angel
• Bar 9
  The 1959 edition has poco cresc., con moto rather than poco più forte
• Bars 33-35
  These bars have been significantly revised. The 1959 version is preferable.
• Bars 37-44
  The 1959 edition has cresc. ed appassionato to ff in bar 39, agitato in bar 42, and poco a poco calmando in bar 44

Op 1 no 2

No differences apart from a Russian footnote in bar 17 that I lack the skill to translate

Op 1 no 3

• Bars 1, 3, 4 and all similar places
  In the 1959 edition, this figure is always a double-dotted quarter note followed by two thirty-second notes. In the original edition the figure is singly dotted.
• Bar 3 and all similar places
  The 1959 edition has a crescendo on the final quarter note in the RH and in the two thirty-second notes in the LH

Op 1 no 4

• Bars 14-15
  The sforzandi are misplaced in the original edition. The 1959 edition puts them above the RH on the last quarter note of each bar.

Op 1 no 5

• Bar 66
  The 1959 edition has another crescendo hairpin immediately following the previous one, which looks like a misprint. The diminuendo hairpin in the original edition is surely correct.

Op 1 no 6

No differences

Op 1 no 7

• Bars 1-2
  The 1959 edition has a number of articulation marks on the top notes of the RH octaves. These are: a slur between the first two C sharps; a slur between the next two C sharps; a slur from the D to the A sharp; a slur from the B to the A natural, with an accent on the B. The same pattern is repeated in bar 2, and presumably applies elsewhere in the piece.
• Bar 8
  The 1959 edition has pedal marks under the low F sharp and low D
• Bar 16
  The 1959 edition has a pedal mark under the low F sharp at the end of the bar
• Bars 19-22, 25-26
  In each of these bars the 1959 edition has a hairpin diminuendos in the RH for the duration of the first dotted quarter note. In bars 21-22 each hairpin is followed by pp.

Op 1 no 8

• Bars 1-2, 5-6, 9-10, 13-14
  The 1959 edition has pedal marks on the first and third beat of each bar
• Bars 4, 8
  In the 1959 edition Medtner indicated that the eight note on the third beat is to be taken with the left hand
• Bars 9-10
  The 1959 edition lacks all the slurs present in the original edition
• Bar 17
  The 1959 edition has a diminuendo hairpin lasting the entire bar
• Bar 25
  The two slurs are absent in the 1959 edition, consistent with the marking non legato. The slurs in bars 26-28 are present in both editions, as is the legato in bar 27.