What final visual impression was communicated to him by the mirror?

The optical reflection of several inverted volumes improperly arranged and not in the order of their common letters with scintillating titles on the two bookshelves opposite.

Catalogue these books.

Thom’s Dublin post office directory, 1886. 
Denis Florence M’Carthy’s poetical works (copper beechleaf bookmark
  at p. 5). 
Shakespeare’s works (dark crimson morocco, goldtooled). 
The useful ready reckoner (brown cloth). 
The secret history of the court of Charles II (red cloth, tooled
  binding). 
The child’s guide (blue cloth). 
The Beauties of Killarney (wrappers). 
When we were boys by William O’Brien M. P. (green cloth, slightly faded,
  envelope bookmark at p. 217). 
Thoughts from Spinoza (maroon leather). 
The story of the heavens by Sir Robert Ball (blue cloth). 
Ellis’s three trips to Madagascar (brown cloth, title obliterated). 
The stark-Munro letters by A. Conan Doyle, property of the City of
  Dublin Public Library, 106 Capel street, lent 21 May (Whitsun Eve)
  1904, due 4 June 1904, 13 days overdue (black cloth binding, bearing
  white letternumber ticket). 
Voyages in china by “Viator” (recovered with brown paper, red ink title). 
Philosophy of the Talmud (sewn pamphlet). 
Lockhart’s life of Napoleon (cover wanting, marginal annotations,
  minimising victories, aggrandising defeats of the protagonist). 
Soll UND HABEN by Gustav Freytag (black boards, Gothic characters,
  cigarette coupon bookmark at p. 24). 
Hozier’s history of the Russo-Turkish war (brown cloth, a volumes, with
  gummed label, Garrison Library, Governor’s Parade, Gibraltar, on verso
  of cover). 
Laurence Bloomfield in Ireland by William Allingham (second edition,
  green cloth, gilt trefoil design, previous owner’s name on recto of
  flyleaf erased). 
A handbook of astronomy (cover, brown leather, detached, S plates,
  antique letterpress long primer, author’s footnotes nonpareil, marginal
  clues brevier, captions small pica). 
The hidden life of Christ (black boards). 
In the track of the sun (yellow cloth, titlepage missing, recurrent title
  intestation). 
Physical strength and how to obtain it by Eugen Sandow (red cloth). 
Short but yet plain elements