The Collaborative International Dictionary of English v.0.48:

Smelling \Smell"ing\, n.
   1. The act of one who smells.
      [1913 Webster]

   2. The sense by which odors are perceived; the sense of
      smell. --Locke.
      [1913 Webster]

   Smelling bottle, a small bottle filled with something
      suited to stimulate the sense of smell, or to remove
      faintness, as spirits of ammonia.
      [1913 Webster]

WordNet (r) 3.0 (2006):

smelling bottle
    n 1: a bottle containing smelling salts