In an apparatus fortreating and applying air for curative and other purposes, the combination of a fan or blower, a supply-pipe provided with a diaphragm or screenof gauze, for holding carbolic acid or other antiseptic, a .pipe through which air is to be forced by said 1 fan, a hopper or Vessel for containing and supplying dry powdered medicaments to a current of air flowing from the fan, and a ha