Source : Webster's Revised Unabridged Dictionary (1913)

Smelling \Smell"ing\, n.
   1. The act of one who smells.

   2. The sense by which odors are perceived; the sense of
      smell. --Locke.

   {Smelling bottle}, a small bottle filled with something
      suited to stimulate the sense of smell, or to remove
      faintness, as spirits of ammonia.

Source : WordNet®

smelling bottle
     n : a bottle containing smelling salts